Merge pull request #3189 from eddyb/rextern

Reintroduce `extern crate` for non-Cargo dependencies.

Cargo.toml

@@ -1,3 +1,5 @@
+cargo-features = ["edition"]
+
 [package]
 name = "clippy"
 version = "0.0.212"

clippy_lints/Cargo.toml

@@ -1,3 +1,5 @@
+cargo-features = ["edition"]
+
 [package]
 name = "clippy_lints"
 # begin automatic update

clippy_lints/src/approx_const.rs

@@ -1,10 +1,10 @@
 use crate::utils::span_lint;
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use std::f64::consts as f64;
-use syntax::ast::{FloatTy, Lit, LitKind};
-use syntax::symbol;
+use crate::syntax::ast::{FloatTy, Lit, LitKind};
+use crate::syntax::symbol;
 
 /// **What it does:** Checks for floating point literals that approximate
 /// constants which are defined in

clippy_lints/src/arithmetic.rs

@@ -1,8 +1,8 @@
 use crate::utils::span_lint;
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::source_map::Span;
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::source_map::Span;
 
 /// **What it does:** Checks for plain integer arithmetic.
 ///

clippy_lints/src/assign_ops.rs

@@ -1,11 +1,11 @@
 use crate::utils::{get_trait_def_id, implements_trait, snippet_opt, span_lint_and_then, SpanlessEq};
 use crate::utils::{higher, sugg};
-use rustc::hir;
-use rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir;
+use crate::rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::ast;
+use crate::syntax::ast;
 
 /// **What it does:** Checks for `a = a op b` or `a = b commutative_op a`
 /// patterns.
@@ -220,7 +220,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for AssignOps {
 }
 
 fn is_commutative(op: hir::BinOpKind) -> bool {
-    use rustc::hir::BinOpKind::*;
+    use crate::rustc::hir::BinOpKind::*;
     match op {
         Add | Mul | And | Or | BitXor | BitAnd | BitOr | Eq | Ne => true,
         Sub | Div | Rem | Shl | Shr | Lt | Le | Ge | Gt => false,

clippy_lints/src/attrs.rs

@@ -5,14 +5,14 @@ use crate::utils::{
     in_macro, last_line_of_span, match_def_path, opt_def_id, paths, snippet_opt, span_lint, span_lint_and_then,
     without_block_comments,
 };
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::{self, TyCtxt};
+use crate::rustc::ty::{self, TyCtxt};
 use semver::Version;
-use syntax::ast::{AttrStyle, Attribute, Lit, LitKind, MetaItemKind, NestedMetaItem, NestedMetaItemKind};
-use syntax::source_map::Span;
+use crate::syntax::ast::{AttrStyle, Attribute, Lit, LitKind, MetaItemKind, NestedMetaItem, NestedMetaItemKind};
+use crate::syntax::source_map::Span;
 
 /// **What it does:** Checks for items annotated with `#[inline(always)]`,
 /// unless the annotated function is empty or simply panics.
@@ -180,10 +180,15 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for AttrPass {
                                                                 || is_word(lint, "deprecated") {
                                                 return
                                         },
-                                        ItemKind::ExternCrate(..) => if is_word(lint, "unused_imports")
-                                                                        && skip_unused_imports {
+                                        ItemKind::ExternCrate(..) => {
+                                            if is_word(lint, "unused_imports")
+                                                && skip_unused_imports {
+                                                    return
+                                            }
+                                            if is_word(lint, "unused_extern_crates") {
                                                 return
-                                        },
+                                            }
+                                        }
                                         _ => {},
                                     }
                                 }

clippy_lints/src/bit_mask.rs

@@ -1,9 +1,9 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::ast::LitKind;
-use syntax::source_map::Span;
+use crate::syntax::ast::LitKind;
+use crate::syntax::source_map::Span;
 use crate::utils::{span_lint, span_lint_and_then};
 use crate::utils::sugg::Sugg;
 use crate::consts::{constant, Constant};

clippy_lints/src/blacklisted_name.rs

@@ -1,6 +1,6 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
 use crate::utils::span_lint;
 
 /// **What it does:** Checks for usage of blacklisted names for variables, such

clippy_lints/src/block_in_if_condition.rs

@@ -1,8 +1,8 @@
 use matches::matches;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use crate::utils::*;
 
 /// **What it does:** Checks for `if` conditions that use blocks to contain an

clippy_lints/src/booleans.rs

@@ -1,10 +1,10 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use rustc::hir::intravisit::*;
-use syntax::ast::{LitKind, NodeId, DUMMY_NODE_ID};
-use syntax::source_map::{dummy_spanned, Span, DUMMY_SP};
-use rustc_data_structures::thin_vec::ThinVec;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::intravisit::*;
+use crate::syntax::ast::{LitKind, NodeId, DUMMY_NODE_ID};
+use crate::syntax::source_map::{dummy_spanned, Span, DUMMY_SP};
+use crate::rustc_data_structures::thin_vec::ThinVec;
 use crate::utils::{in_macro, paths, match_type, snippet_opt, span_lint_and_then, SpanlessEq, get_trait_def_id, implements_trait};
 
 /// **What it does:** Checks for boolean expressions that can be written more

clippy_lints/src/bytecount.rs

@@ -1,9 +1,9 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty;
-use syntax::ast::{Name, UintTy};
+use crate::rustc::ty;
+use crate::syntax::ast::{Name, UintTy};
 use crate::utils::{contains_name, get_pat_name, match_type, paths, single_segment_path, snippet, span_lint_and_sugg,
             walk_ptrs_ty};
 

clippy_lints/src/collapsible_if.rs

@@ -12,10 +12,10 @@
 //!
 //! This lint is **warn** by default
 
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::ast;
+use crate::syntax::ast;
 
 use crate::utils::{in_macro, snippet_block, span_lint_and_sugg, span_lint_and_then};
 use crate::utils::sugg::Sugg;

clippy_lints/src/const_static_lifetime.rs

@@ -1,6 +1,6 @@
-use syntax::ast::*;
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use crate::utils::{in_macro, snippet, span_lint_and_then};
 
 /// **What it does:** Checks for constants with an explicit `'static` lifetime.

clippy_lints/src/consts.rs

@@ -1,18 +1,18 @@
 #![allow(clippy::float_cmp)]
 
-use rustc::lint::LateContext;
-use rustc::{span_bug, bug};
-use rustc::hir::def::Def;
-use rustc::hir::*;
-use rustc::ty::{self, Ty, TyCtxt, Instance};
-use rustc::ty::subst::{Subst, Substs};
+use crate::rustc::lint::LateContext;
+use crate::rustc::{span_bug, bug};
+use crate::rustc::hir::def::Def;
+use crate::rustc::hir::*;
+use crate::rustc::ty::{self, Ty, TyCtxt, Instance};
+use crate::rustc::ty::subst::{Subst, Substs};
 use std::cmp::Ordering::{self, Equal};
 use std::cmp::PartialOrd;
 use std::hash::{Hash, Hasher};
 use std::mem;
 use std::rc::Rc;
-use syntax::ast::{FloatTy, LitKind};
-use syntax::ptr::P;
+use crate::syntax::ast::{FloatTy, LitKind};
+use crate::syntax::ptr::P;
 use crate::utils::{sext, unsext, clip};
 
 /// A `LitKind`-like enum to fold constant `Expr`s into.
@@ -139,7 +139,7 @@ impl Constant {
 
 /// parse a `LitKind` to a `Constant`
 pub fn lit_to_constant<'tcx>(lit: &LitKind, ty: Ty<'tcx>) -> Constant {
-    use syntax::ast::*;
+    use crate::syntax::ast::*;
 
     match *lit {
         LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
@@ -279,7 +279,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
                     instance,
                     promoted: None,
                 };
-                use rustc::mir::interpret::GlobalId;
+                use crate::rustc::mir::interpret::GlobalId;
                 let result = self.tcx.const_eval(self.param_env.and(gid)).ok()?;
                 let ret = miri_to_const(self.tcx, result);
                 if ret.is_some() {
@@ -409,7 +409,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
 }
 
 pub fn miri_to_const<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, result: &ty::Const<'tcx>) -> Option<Constant> {
-    use rustc::mir::interpret::{Scalar, ScalarMaybeUndef, ConstValue};
+    use crate::rustc::mir::interpret::{Scalar, ScalarMaybeUndef, ConstValue};
     match result.val {
         ConstValue::Scalar(Scalar::Bits{ bits: b, ..}) => match result.ty.sty {
             ty::Bool => Some(Constant::Bool(b == 1)),

clippy_lints/src/copies.rs

@@ -1,12 +1,12 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty::Ty;
-use rustc::hir::*;
-use rustc_data_structures::fx::FxHashMap;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty::Ty;
+use crate::rustc::hir::*;
+use crate::rustc_data_structures::fx::FxHashMap;
 use std::collections::hash_map::Entry;
 use std::hash::BuildHasherDefault;
-use syntax::symbol::LocalInternedString;
-use rustc_data_structures::small_vec::OneVector;
+use crate::syntax::symbol::LocalInternedString;
+use crate::rustc_data_structures::small_vec::OneVector;
 use crate::utils::{SpanlessEq, SpanlessHash};
 use crate::utils::{get_parent_expr, in_macro, snippet, span_lint_and_then, span_note_and_lint};
 

clippy_lints/src/copy_iterator.rs

@@ -1,7 +1,7 @@
 use crate::utils::{is_copy, match_path, paths, span_note_and_lint};
-use rustc::hir::{Item, ItemKind};
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::{Item, ItemKind};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 
 /// **What it does:** Checks for types that implement `Copy` as well as
 /// `Iterator`.

clippy_lints/src/cyclomatic_complexity.rs

@@ -1,13 +1,13 @@
 //! calculate cyclomatic complexity and warn about overly complex functions
 
-use rustc::cfg::CFG;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, LintContext};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use rustc::ty;
-use rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
-use syntax::ast::{Attribute, NodeId};
-use syntax::source_map::Span;
+use crate::rustc::cfg::CFG;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::ty;
+use crate::rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
+use crate::syntax::ast::{Attribute, NodeId};
+use crate::syntax::source_map::Span;
 
 use crate::utils::{in_macro, is_allowed, match_type, paths, span_help_and_lint, LimitStack};
 

clippy_lints/src/default_trait_access.rs

@@ -1,8 +1,8 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::TyKind;
+use crate::rustc::ty::TyKind;
 
 use crate::utils::{any_parent_is_automatically_derived, match_def_path, opt_def_id, paths, span_lint_and_sugg};
 

clippy_lints/src/derive.rs

@@ -1,9 +1,9 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
-use rustc::hir::*;
-use syntax::source_map::Span;
+use crate::rustc::ty::{self, Ty};
+use crate::rustc::hir::*;
+use crate::syntax::source_map::Span;
 use crate::utils::paths;
 use crate::utils::{is_automatically_derived, is_copy, match_path, span_lint_and_then};
 

clippy_lints/src/doc.rs

@@ -1,10 +1,10 @@
 use itertools::Itertools;
 use pulldown_cmark;
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast;
-use syntax::source_map::{BytePos, Span};
-use syntax_pos::Pos;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast;
+use crate::syntax::source_map::{BytePos, Span};
+use crate::syntax_pos::Pos;
 use crate::utils::span_lint;
 use url::Url;
 

clippy_lints/src/double_comparison.rs

@@ -1,9 +1,9 @@
 //! Lint on unnecessary double comparisons. Some examples:
 
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::source_map::Span;
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::source_map::Span;
 
 use crate::utils::{snippet, span_lint_and_sugg, SpanlessEq};
 

clippy_lints/src/double_parens.rs

@@ -1,6 +1,6 @@
-use syntax::ast::*;
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintContext, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintContext, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 
 /// **What it does:** Checks for unnecessary double parentheses.
 ///

clippy_lints/src/drop_forget_ref.rs

@@ -1,8 +1,8 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty;
-use rustc::hir::*;
+use crate::rustc::ty;
+use crate::rustc::hir::*;
 use crate::utils::{is_copy, match_def_path, opt_def_id, paths, span_note_and_lint};
 
 /// **What it does:** Checks for calls to `std::mem::drop` with a reference

clippy_lints/src/duration_subsec.rs

@@ -1,8 +1,8 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::source_map::Spanned;
+use crate::syntax::source_map::Spanned;
 
 use crate::consts::{constant, Constant};
 use crate::utils::paths;

clippy_lints/src/else_if_without_else.rs

@@ -1,8 +1,8 @@
 //! lint on if expressions with an else if, but without a final else branch
 
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
 
 use crate::utils::span_lint_and_sugg;
 

clippy_lints/src/empty_enum.rs

@@ -1,8 +1,8 @@
 //! lint when there is an enum with no variants
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
 use crate::utils::span_lint_and_then;
 
 /// **What it does:** Checks for `enum`s with no variants.

clippy_lints/src/entry.rs

@@ -1,9 +1,9 @@
-use rustc::hir::*;
-use rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::source_map::Span;
+use crate::syntax::source_map::Span;
 use crate::utils::SpanlessEq;
 use crate::utils::{get_item_name, match_type, paths, snippet, span_lint_and_then, walk_ptrs_ty};
 

clippy_lints/src/enum_clike.rs

@@ -1,16 +1,16 @@
 //! lint on C-like enums that are `repr(isize/usize)` and have values that
 //! don't fit into an `i32`
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use rustc::ty;
-use rustc::ty::subst::Substs;
-use syntax::ast::{IntTy, UintTy};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::ty;
+use crate::rustc::ty::subst::Substs;
+use crate::syntax::ast::{IntTy, UintTy};
 use crate::utils::span_lint;
 use crate::consts::{Constant, miri_to_const};
-use rustc::ty::util::IntTypeExt;
-use rustc::mir::interpret::GlobalId;
+use crate::rustc::ty::util::IntTypeExt;
+use crate::rustc::mir::interpret::GlobalId;
 
 /// **What it does:** Checks for C-like enumerations that are
 /// `repr(isize/usize)` and have values that don't fit into an `i32`.

clippy_lints/src/enum_glob_use.rs

@@ -1,11 +1,11 @@
 //! lint on `use`ing all variants of an enum
 
-use rustc::hir::*;
-use rustc::hir::def::Def;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::NodeId;
-use syntax::source_map::Span;
+use crate::rustc::hir::*;
+use crate::rustc::hir::def::Def;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::NodeId;
+use crate::syntax::source_map::Span;
 use crate::utils::span_lint;
 
 /// **What it does:** Checks for `use Enum::*`.

clippy_lints/src/enum_variants.rs

@@ -1,10 +1,10 @@
 //! lint on enum variants that are prefixed or suffixed by the same characters
 
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, Lint};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
-use syntax::source_map::Span;
-use syntax::symbol::LocalInternedString;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, Lint};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
+use crate::syntax::source_map::Span;
+use crate::syntax::symbol::LocalInternedString;
 use crate::utils::{span_help_and_lint, span_lint};
 use crate::utils::{camel_case_from, camel_case_until, in_macro};
 

clippy_lints/src/eq_op.rs

@@ -1,6 +1,6 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use crate::utils::{in_macro, implements_trait, is_copy, multispan_sugg, snippet, span_lint, span_lint_and_then, SpanlessEq};
 
 /// **What it does:** Checks for equal operands to comparison, logical and

clippy_lints/src/erasing_op.rs

@@ -1,8 +1,8 @@
 use crate::consts::{constant_simple, Constant};
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::source_map::Span;
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::source_map::Span;
 use crate::utils::{in_macro, span_lint};
 
 /// **What it does:** Checks for erasing operations, e.g. `x * 0`.

clippy_lints/src/escape.rs

@@ -1,14 +1,14 @@
-use rustc::hir::*;
-use rustc::hir::intravisit as visit;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::middle::expr_use_visitor::*;
-use rustc::middle::mem_categorization::{cmt_, Categorization};
-use rustc::ty::{self, Ty};
-use rustc::ty::layout::LayoutOf;
-use rustc::util::nodemap::NodeSet;
-use syntax::ast::NodeId;
-use syntax::source_map::Span;
+use crate::rustc::hir::*;
+use crate::rustc::hir::intravisit as visit;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::middle::expr_use_visitor::*;
+use crate::rustc::middle::mem_categorization::{cmt_, Categorization};
+use crate::rustc::ty::{self, Ty};
+use crate::rustc::ty::layout::LayoutOf;
+use crate::rustc::util::nodemap::NodeSet;
+use crate::syntax::ast::NodeId;
+use crate::syntax::source_map::Span;
 use crate::utils::span_lint;
 
 pub struct Pass {

clippy_lints/src/eta_reduction.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty;
-use rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty;
+use crate::rustc::hir::*;
 use crate::utils::{is_adjusted, iter_input_pats, snippet_opt, span_lint_and_then};
 
 #[allow(missing_copy_implementations)]

clippy_lints/src/eval_order_dependence.rs

@@ -1,10 +1,10 @@
-use rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
-use rustc::hir::*;
-use rustc::ty;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
+use crate::rustc::hir::*;
+use crate::rustc::ty;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::ast;
+use crate::syntax::ast;
 use crate::utils::{get_parent_expr, span_lint, span_note_and_lint};
 
 /// **What it does:** Checks for a read and a write to the same variable where

clippy_lints/src/excessive_precision.rs

@@ -1,13 +1,13 @@
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::TyKind;
+use crate::rustc::ty::TyKind;
 use std::f32;
 use std::f64;
 use std::fmt;
-use syntax::ast::*;
-use syntax_pos::symbol::Symbol;
+use crate::syntax::ast::*;
+use crate::syntax_pos::symbol::Symbol;
 use crate::utils::span_lint_and_sugg;
 
 /// **What it does:** Checks for float literals with a precision greater

clippy_lints/src/explicit_write.rs

@@ -1,6 +1,6 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
 use crate::utils::{is_expn_of, match_def_path, resolve_node, span_lint};
 use crate::utils::opt_def_id;

clippy_lints/src/fallible_impl_from.rs

@@ -1,9 +1,9 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir;
-use rustc::ty;
-use syntax_pos::Span;
+use crate::rustc::hir;
+use crate::rustc::ty;
+use crate::syntax_pos::Span;
 use crate::utils::{match_def_path, method_chain_args, span_lint_and_then, walk_ptrs_ty, is_expn_of, opt_def_id};
 use crate::utils::paths::{BEGIN_PANIC, BEGIN_PANIC_FMT, FROM_TRAIT, OPTION, RESULT};
 
@@ -52,8 +52,8 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for FallibleImplFrom {
 }
 
 fn lint_impl_body<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, impl_span: Span, impl_items: &hir::HirVec<hir::ImplItemRef>) {
-    use rustc::hir::*;
-    use rustc::hir::intravisit::{self, NestedVisitorMap, Visitor};
+    use crate::rustc::hir::*;
+    use crate::rustc::hir::intravisit::{self, NestedVisitorMap, Visitor};
 
     struct FindPanicUnwrap<'a, 'tcx: 'a> {
         tcx: ty::TyCtxt<'a, 'tcx, 'tcx>,

clippy_lints/src/format.rs

@@ -1,10 +1,10 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty;
-use syntax::ast::LitKind;
-use syntax_pos::Span;
+use crate::rustc::ty;
+use crate::syntax::ast::LitKind;
+use crate::syntax_pos::Span;
 use crate::utils::paths;
 use crate::utils::{in_macro, is_expn_of, last_path_segment, match_def_path, match_type, opt_def_id, resolve_node, snippet, span_lint_and_then, walk_ptrs_ty};
 

clippy_lints/src/formatting.rs

@@ -1,8 +1,8 @@
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast;
 use crate::utils::{differing_macro_contexts, in_macro, snippet_opt, span_note_and_lint};
-use syntax::ptr::P;
+use crate::syntax::ptr::P;
 
 /// **What it does:** Checks for use of the non-existent `=*`, `=!` and `=-`
 /// operators.

clippy_lints/src/functions.rs

@@ -1,14 +1,14 @@
 use matches::matches;
-use rustc::hir::intravisit;
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty;
-use rustc::hir::def::Def;
-use rustc_data_structures::fx::FxHashSet;
-use syntax::ast;
-use rustc_target::spec::abi::Abi;
-use syntax::source_map::Span;
+use crate::rustc::hir::intravisit;
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty;
+use crate::rustc::hir::def::Def;
+use crate::rustc_data_structures::fx::FxHashSet;
+use crate::syntax::ast;
+use crate::rustc_target::spec::abi::Abi;
+use crate::syntax::source_map::Span;
 use crate::utils::{iter_input_pats, span_lint, type_is_unsafe_function};
 
 /// **What it does:** Checks for functions with too many parameters.

clippy_lints/src/identity_conversion.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use syntax::ast::NodeId;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::syntax::ast::NodeId;
 use crate::utils::{in_macro, match_def_path, match_trait_method, same_tys, snippet, span_lint_and_then};
 use crate::utils::{opt_def_id, paths, resolve_node};
 

clippy_lints/src/identity_op.rs

@@ -1,10 +1,10 @@
 use crate::consts::{constant_simple, Constant};
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::source_map::Span;
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::source_map::Span;
 use crate::utils::{in_macro, snippet, span_lint, unsext, clip};
-use rustc::ty;
+use crate::rustc::ty;
 
 /// **What it does:** Checks for identity operations, e.g. `x + 0`.
 ///

clippy_lints/src/if_let_redundant_pattern_matching.rs

@@ -1,6 +1,6 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
 use crate::utils::{match_qpath, paths, snippet, span_lint_and_then};
 
 /// **What it does:** Lint for redundant pattern matching over `Result` or

clippy_lints/src/if_not_else.rs

@@ -1,9 +1,9 @@
 //! lint on if branches that could be swapped so no `!` operation is necessary
 //! on the condition
 
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
 
 use crate::utils::span_help_and_lint;
 

clippy_lints/src/indexing_slicing.rs

@@ -4,11 +4,11 @@ use crate::consts::{constant, Constant};
 use crate::utils;
 use crate::utils::higher;
 use crate::utils::higher::Range;
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty;
-use syntax::ast::RangeLimits;
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty;
+use crate::syntax::ast::RangeLimits;
 
 /// **What it does:** Checks for out of bounds array indexing with a constant
 /// index.

clippy_lints/src/infallible_destructuring_match.rs

@@ -1,7 +1,7 @@
 use super::utils::{get_arg_name, match_var, remove_blocks, snippet, span_lint_and_sugg};
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
 
 /// **What it does:** Checks for matches being used to destructure a single-variant enum

clippy_lints/src/infinite_iter.rs

@@ -1,6 +1,6 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use crate::utils::{get_trait_def_id, higher, implements_trait, match_qpath, paths, span_lint};
 
 /// **What it does:** Checks for iteration that is guaranteed to be infinite.

clippy_lints/src/inherent_impl.rs

@@ -1,11 +1,11 @@
 //! lint on inherent implementations
 
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc_data_structures::fx::FxHashMap;
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc_data_structures::fx::FxHashMap;
 use std::default::Default;
-use syntax_pos::Span;
+use crate::syntax_pos::Span;
 use crate::utils::span_lint_and_then;
 
 /// **What it does:** Checks for multiple inherent implementations of a struct

clippy_lints/src/inline_fn_without_body.rs

@@ -1,9 +1,9 @@
 //! checks for `#[inline]` on trait methods without bodies
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use syntax::ast::{Attribute, Name};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::syntax::ast::{Attribute, Name};
 use crate::utils::span_lint_and_then;
 use crate::utils::sugg::DiagnosticBuilderExt;
 

clippy_lints/src/int_plus_one.rs

@@ -1,8 +1,8 @@
 //! lint on blocks unnecessarily using >= with a + 1 or - 1
 
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
 
 use crate::utils::{snippet_opt, span_lint_and_then};
 

clippy_lints/src/invalid_ref.rs

@@ -1,8 +1,8 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty;
-use rustc::hir::*;
+use crate::rustc::ty;
+use crate::rustc::hir::*;
 use crate::utils::{match_def_path, opt_def_id, paths, span_help_and_lint};
 
 /// **What it does:** Checks for creation of references to zeroed or uninitialized memory.

clippy_lints/src/items_after_statements.rs

@@ -1,9 +1,9 @@
 //! lint when items are used after statements
 
 use matches::matches;
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
 use crate::utils::{in_macro, span_lint};
 
 /// **What it does:** Checks for items declared after some statement in a block.

clippy_lints/src/large_enum_variant.rs

@@ -1,10 +1,10 @@
 //! lint when there is a large size difference between variants on an enum
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
 use crate::utils::{snippet_opt, span_lint_and_then};
-use rustc::ty::layout::LayoutOf;
+use crate::rustc::ty::layout::LayoutOf;
 
 /// **What it does:** Checks for large size differences between variants on
 /// `enum`s.

clippy_lints/src/len_zero.rs

@@ -1,11 +1,11 @@
-use rustc::hir::def_id::DefId;
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty;
-use rustc_data_structures::fx::FxHashSet;
-use syntax::ast::{Lit, LitKind, Name};
-use syntax::source_map::{Span, Spanned};
+use crate::rustc::hir::def_id::DefId;
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty;
+use crate::rustc_data_structures::fx::FxHashSet;
+use crate::syntax::ast::{Lit, LitKind, Name};
+use crate::syntax::source_map::{Span, Spanned};
 use crate::utils::{get_item_name, in_macro, snippet, span_lint, span_lint_and_sugg, walk_ptrs_ty};
 
 /// **What it does:** Checks for getting the length of something via `.len()`
@@ -127,7 +127,7 @@ fn check_trait_items(cx: &LateContext<'_, '_>, visited_trait: &Item, trait_items
     // fill the set with current and super traits
     fn fill_trait_set(traitt: DefId, set: &mut FxHashSet<DefId>, cx: &LateContext<'_, '_>) {
         if set.insert(traitt) {
-            for supertrait in ::rustc::traits::supertrait_def_ids(cx.tcx, traitt) {
+            for supertrait in crate::rustc::traits::supertrait_def_ids(cx.tcx, traitt) {
                 fill_trait_set(supertrait, set, cx);
             }
         }

clippy_lints/src/let_if_seq.rs

@@ -1,10 +1,10 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir;
-use rustc::hir::BindingAnnotation;
-use rustc::hir::def::Def;
-use syntax::ast;
+use crate::rustc::hir;
+use crate::rustc::hir::BindingAnnotation;
+use crate::rustc::hir::def::Def;
+use crate::syntax::ast;
 use crate::utils::{snippet, span_lint_and_then};
 
 /// **What it does:** Checks for variable declarations immediately followed by a

clippy_lints/src/lib.rs

@@ -12,10 +12,28 @@
 #![warn(rust_2018_idioms, trivial_casts, trivial_numeric_casts)]
 #![feature(crate_visibility_modifier)]
 
-use toml;
-use rustc_plugin;
-use rustc;
+// FIXME: switch to something more ergonomic here, once available.
+// (currently there is no way to opt into sysroot crates w/o `extern crate`)
+#[allow(unused_extern_crates)]
+extern crate fmt_macros;
+#[allow(unused_extern_crates)]
+extern crate rustc;
+#[allow(unused_extern_crates)]
+extern crate rustc_data_structures;
+#[allow(unused_extern_crates)]
+extern crate rustc_errors;
+#[allow(unused_extern_crates)]
+extern crate rustc_plugin;
+#[allow(unused_extern_crates)]
+extern crate rustc_target;
+#[allow(unused_extern_crates)]
+extern crate rustc_typeck;
+#[allow(unused_extern_crates)]
+extern crate syntax;
+#[allow(unused_extern_crates)]
+extern crate syntax_pos;
 
+use toml;
 
 macro_rules! declare_clippy_lint {
     { pub $name:tt, style, $description:tt } => {
@@ -175,7 +193,7 @@ pub mod zero_div_zero;
 pub use crate::utils::conf::Conf;
 
 mod reexport {
-    crate use syntax::ast::{Name, NodeId};
+    crate use crate::syntax::ast::{Name, NodeId};
 }
 
 pub fn register_pre_expansion_lints(session: &rustc::session::Session, store: &mut rustc::lint::LintStore, conf: &Conf) {

clippy_lints/src/lifetimes.rs

@@ -1,14 +1,14 @@
 use crate::reexport::*;
 use matches::matches;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::def::Def;
-use rustc::hir::*;
-use rustc::hir::intravisit::*;
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use syntax::source_map::Span;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::def::Def;
+use crate::rustc::hir::*;
+use crate::rustc::hir::intravisit::*;
+use crate::rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use crate::syntax::source_map::Span;
 use crate::utils::{last_path_segment, span_lint};
-use syntax::symbol::keywords;
+use crate::syntax::symbol::keywords;
 
 /// **What it does:** Checks for lifetime annotations which can be removed by
 /// relying on lifetime elision.

clippy_lints/src/literal_representation.rs

@@ -1,11 +1,11 @@
 //! Lints concerned with the grouping of digits with underscores in integral or
 //! floating-point literal expressions.
 
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::ast::*;
-use syntax_pos;
+use crate::syntax::ast::*;
+use crate::syntax_pos;
 use crate::utils::{snippet_opt, span_lint_and_sugg};
 
 /// **What it does:** Warns if a long integral or floating-point constant does

clippy_lints/src/loops.rs

@@ -1,25 +1,25 @@
 use itertools::Itertools;
 use crate::reexport::*;
-use rustc::hir::*;
-use rustc::hir::def::Def;
-use rustc::hir::def_id;
-use rustc::hir::intravisit::{walk_block, walk_decl, walk_expr, walk_pat, walk_stmt, NestedVisitorMap, Visitor};
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::def::Def;
+use crate::rustc::hir::def_id;
+use crate::rustc::hir::intravisit::{walk_block, walk_decl, walk_expr, walk_pat, walk_stmt, NestedVisitorMap, Visitor};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::middle::region;
-// use rustc::middle::region::CodeExtent;
-use rustc::middle::expr_use_visitor::*;
-use rustc::middle::mem_categorization::Categorization;
-use rustc::middle::mem_categorization::cmt_;
-use rustc::ty::{self, Ty};
-use rustc::ty::subst::Subst;
-use rustc_errors::Applicability;
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use crate::rustc::middle::region;
+// use crate::rustc::middle::region::CodeExtent;
+use crate::rustc::middle::expr_use_visitor::*;
+use crate::rustc::middle::mem_categorization::Categorization;
+use crate::rustc::middle::mem_categorization::cmt_;
+use crate::rustc::ty::{self, Ty};
+use crate::rustc::ty::subst::Subst;
+use crate::rustc_errors::Applicability;
+use crate::rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use std::iter::{once, Iterator};
-use syntax::ast;
-use syntax::source_map::Span;
-use syntax_pos::BytePos;
+use crate::syntax::ast;
+use crate::syntax::source_map::Span;
+use crate::syntax_pos::BytePos;
 use crate::utils::{sugg, sext};
 use crate::utils::usage::mutated_variables;
 use crate::consts::{constant, Constant};

clippy_lints/src/map_clone.rs

@@ -1,9 +1,9 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::*;
-use rustc::ty;
-use syntax::ast;
+use crate::rustc::hir::*;
+use crate::rustc::ty;
+use crate::syntax::ast;
 use crate::utils::{get_arg_ident, is_adjusted, iter_input_pats, match_qpath, match_trait_method, match_type,
             paths, remove_blocks, snippet, span_help_and_lint, walk_ptrs_ty, walk_ptrs_ty_depth, SpanlessEq};
 

clippy_lints/src/map_unit_fn.rs

@@ -1,10 +1,10 @@
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty;
-use rustc_errors::Applicability;
-use syntax::source_map::Span;
+use crate::rustc::ty;
+use crate::rustc_errors::Applicability;
+use crate::syntax::source_map::Span;
 use crate::utils::{in_macro, iter_input_pats, match_type, method_chain_args, snippet, span_lint_and_then};
 use crate::utils::paths;
 

clippy_lints/src/matches.rs

@@ -1,12 +1,12 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
+use crate::rustc::ty::{self, Ty};
 use std::cmp::Ordering;
 use std::collections::Bound;
-use syntax::ast::LitKind;
-use syntax::source_map::Span;
+use crate::syntax::ast::LitKind;
+use crate::syntax::source_map::Span;
 use crate::utils::paths;
 use crate::utils::{expr_block, is_allowed, is_expn_of, match_qpath, match_type, multispan_sugg,
             remove_blocks, snippet, span_lint_and_sugg, span_lint_and_then, span_note_and_lint, walk_ptrs_ty};

clippy_lints/src/mem_forget.rs

@@ -1,6 +1,6 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::{Expr, ExprKind};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::{Expr, ExprKind};
 use crate::utils::{match_def_path, opt_def_id, paths, span_lint};
 
 /// **What it does:** Checks for usage of `std::mem::forget(t)` where `t` is

clippy_lints/src/methods.rs

@@ -1,15 +1,15 @@
 use matches::matches;
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, Lint, LintContext};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, Lint, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
-use rustc::hir::def::Def;
+use crate::rustc::ty::{self, Ty};
+use crate::rustc::hir::def::Def;
 use std::borrow::Cow;
 use std::fmt;
 use std::iter;
-use syntax::ast;
-use syntax::source_map::{Span, BytePos};
+use crate::syntax::ast;
+use crate::syntax::source_map::{Span, BytePos};
 use crate::utils::{get_arg_name, get_trait_def_id, implements_trait, in_macro, is_copy, is_expn_of, is_self,
             is_self_ty, iter_input_pats, last_path_segment, match_def_path, match_path, match_qpath, match_trait_method,
             match_type, method_chain_args, match_var, return_ty, remove_blocks, same_tys, single_segment_path, snippet,

clippy_lints/src/minmax.rs

@@ -1,8 +1,8 @@
 use crate::consts::{constant_simple, Constant};
 use crate::utils::{match_def_path, opt_def_id, paths, span_lint};
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use std::cmp::Ordering;
 
 /// **What it does:** Checks for expressions where `std::cmp::min` and `max` are

clippy_lints/src/misc.rs

@@ -1,17 +1,17 @@
 use crate::reexport::*;
 use matches::matches;
-use rustc::hir::*;
-use rustc::hir::intravisit::FnKind;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::intravisit::FnKind;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty;
-use syntax::source_map::{ExpnFormat, Span};
+use crate::rustc::ty;
+use crate::syntax::source_map::{ExpnFormat, Span};
 use crate::utils::{get_item_name, get_parent_expr, implements_trait, in_constant, in_macro, is_integer_literal,
             iter_input_pats, last_path_segment, match_qpath, match_trait_method, paths, snippet, span_lint,
             span_lint_and_then, walk_ptrs_ty, SpanlessEq};
 use crate::utils::sugg::Sugg;
-use syntax::ast::{LitKind, CRATE_NODE_ID};
+use crate::syntax::ast::{LitKind, CRATE_NODE_ID};
 use crate::consts::{constant, Constant};
 
 /// **What it does:** Checks for function arguments and let bindings denoted as

clippy_lints/src/misc_early.rs

@@ -1,11 +1,11 @@
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, LintContext, in_external_macro};
-use rustc::{declare_tool_lint, lint_array};
-use rustc_data_structures::fx::FxHashMap;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass, LintContext, in_external_macro};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc_data_structures::fx::FxHashMap;
 use if_chain::if_chain;
 use std::char;
-use syntax::ast::*;
-use syntax::source_map::Span;
-use syntax::visit::FnKind;
+use crate::syntax::ast::*;
+use crate::syntax::source_map::Span;
+use crate::syntax::visit::FnKind;
 use crate::utils::{constants, snippet, snippet_opt, span_help_and_lint, span_lint, span_lint_and_then};
 
 /// **What it does:** Checks for structure field patterns bound to wildcards.

clippy_lints/src/missing_doc.rs

@@ -18,13 +18,13 @@
 // [`missing_doc`]: https://github.com/rust-lang/rust/blob/d6d05904697d89099b55da3331155392f1db9c00/src/librustc_lint/builtin.rs#L246
 //
 
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, LintContext};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty;
-use syntax::ast;
-use syntax::attr;
-use syntax::source_map::Span;
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty;
+use crate::syntax::ast;
+use crate::syntax::attr;
+use crate::syntax::source_map::Span;
 use crate::utils::{span_lint, in_macro};
 
 /// **What it does:** Warns if there is missing doc for any documentable item

clippy_lints/src/missing_inline.rs

@@ -9,11 +9,11 @@
 //   except according to those terms.
 //
 
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast;
-use syntax::source_map::Span;
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast;
+use crate::syntax::source_map::Span;
 use crate::utils::span_lint;
 
 /// **What it does:** it lints if an exported function, method, trait method with default impl,
@@ -85,7 +85,7 @@ fn check_missing_inline_attrs(cx: &LateContext<'_, '_>,
 }
 
 fn is_executable<'a, 'tcx>(cx: &LateContext<'a, 'tcx>) -> bool {
-    use rustc::session::config::CrateType;
+    use crate::rustc::session::config::CrateType;
 
     cx.tcx.sess.crate_types.get().iter().any(|t: &CrateType| {
         match t {
@@ -155,7 +155,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingInline {
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'a, 'tcx>, impl_item: &'tcx hir::ImplItem) {
-        use rustc::ty::{TraitContainer, ImplContainer};
+        use crate::rustc::ty::{TraitContainer, ImplContainer};
         if is_executable(cx) {
             return;
         }

clippy_lints/src/multiple_crate_versions.rs

@@ -1,8 +1,8 @@
 //! lint on multiple versions of a crate being used
 
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
 use crate::utils::span_lint;
 
 use cargo_metadata;

clippy_lints/src/mut_mut.rs

@@ -1,8 +1,8 @@
-use rustc::hir;
-use rustc::hir::intravisit;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty;
+use crate::rustc::hir;
+use crate::rustc::hir::intravisit;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty;
 use crate::utils::{higher, span_lint};
 
 /// **What it does:** Checks for instances of `mut mut` references.
@@ -38,7 +38,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MutMut {
     }
 
     fn check_ty(&mut self, cx: &LateContext<'a, 'tcx>, ty: &'tcx hir::Ty) {
-        use rustc::hir::intravisit::Visitor;
+        use crate::rustc::hir::intravisit::Visitor;
 
         MutVisitor { cx }.visit_ty(ty);
     }

clippy_lints/src/mut_reference.rs

@@ -1,8 +1,8 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty::{self, Ty};
-use rustc::ty::subst::Subst;
-use rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty::{self, Ty};
+use crate::rustc::ty::subst::Subst;
+use crate::rustc::hir::*;
 use crate::utils::span_lint;
 
 /// **What it does:** Detects giving a mutable reference to a function that only

clippy_lints/src/mutex_atomic.rs

@@ -2,11 +2,11 @@
 //!
 //! This lint is **warn** by default
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty::{self, Ty};
-use rustc::hir::Expr;
-use syntax::ast;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty::{self, Ty};
+use crate::rustc::hir::Expr;
+use crate::syntax::ast;
 use crate::utils::{match_type, paths, span_lint};
 
 /// **What it does:** Checks for usages of `Mutex<X>` where an atomic will do.

clippy_lints/src/needless_bool.rs

@@ -2,11 +2,11 @@
 //!
 //! This lint is **warn** by default
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use syntax::ast::LitKind;
-use syntax::source_map::Spanned;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::syntax::ast::LitKind;
+use crate::syntax::source_map::Spanned;
 use crate::utils::{snippet, span_lint, span_lint_and_sugg};
 use crate::utils::sugg::Sugg;
 

clippy_lints/src/needless_borrow.rs

@@ -2,12 +2,12 @@
 //!
 //! This lint is **warn** by default
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::{BindingAnnotation, Expr, ExprKind, MutImmutable, Pat, PatKind};
-use rustc::ty;
-use rustc::ty::adjustment::{Adjust, Adjustment};
+use crate::rustc::hir::{BindingAnnotation, Expr, ExprKind, MutImmutable, Pat, PatKind};
+use crate::rustc::ty;
+use crate::rustc::ty::adjustment::{Adjust, Adjustment};
 use crate::utils::{in_macro, snippet_opt, span_lint_and_then};
 
 /// **What it does:** Checks for address of operations (`&`) that are going to

clippy_lints/src/needless_borrowed_ref.rs

@@ -2,10 +2,10 @@
 //!
 //! This lint is **warn** by default
 
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::{BindingAnnotation, MutImmutable, Pat, PatKind};
+use crate::rustc::hir::{BindingAnnotation, MutImmutable, Pat, PatKind};
 use crate::utils::{in_macro, snippet, span_lint_and_then};
 
 /// **What it does:** Checks for useless borrowed references.

clippy_lints/src/needless_continue.rs

@@ -27,10 +27,10 @@
 //! ```
 //!
 //! This lint is **warn** by default.
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast;
-use syntax::source_map::{original_sp, DUMMY_SP};
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast;
+use crate::syntax::source_map::{original_sp, DUMMY_SP};
 use std::borrow::Cow;
 
 use crate::utils::{in_macro, snippet, snippet_block, span_help_and_lint, trim_multiline};

clippy_lints/src/needless_pass_by_value.rs

@@ -1,18 +1,18 @@
 use matches::matches;
-use rustc::hir::*;
-use rustc::hir::intravisit::FnKind;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::intravisit::FnKind;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::{self, RegionKind, TypeFoldable};
-use rustc::traits;
-use rustc::middle::expr_use_visitor as euv;
-use rustc::middle::mem_categorization as mc;
-use rustc_target::spec::abi::Abi;
-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use syntax::ast::NodeId;
-use syntax_pos::Span;
-use syntax::errors::DiagnosticBuilder;
+use crate::rustc::ty::{self, RegionKind, TypeFoldable};
+use crate::rustc::traits;
+use crate::rustc::middle::expr_use_visitor as euv;
+use crate::rustc::middle::mem_categorization as mc;
+use crate::rustc_target::spec::abi::Abi;
+use crate::rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use crate::syntax::ast::NodeId;
+use crate::syntax_pos::Span;
+use crate::syntax::errors::DiagnosticBuilder;
 use crate::utils::{get_trait_def_id, implements_trait, in_macro, is_copy, is_self, match_type, multispan_sugg, paths,
             snippet, snippet_opt, span_lint_and_then};
 use crate::utils::ptr::get_spans;

clippy_lints/src/needless_update.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::ty;
-use rustc::hir::{Expr, ExprKind};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::ty;
+use crate::rustc::hir::{Expr, ExprKind};
 use crate::utils::span_lint;
 
 /// **What it does:** Checks for needlessly including a base struct on update

clippy_lints/src/neg_cmp_op_on_partial_ord.rs

@@ -1,6 +1,6 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
 
 use crate::utils::{self, paths, span_lint};

clippy_lints/src/neg_multiply.rs

@@ -1,8 +1,8 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::source_map::{Span, Spanned};
+use crate::syntax::source_map::{Span, Spanned};
 
 use crate::consts::{self, Constant};
 use crate::utils::span_lint;

clippy_lints/src/new_without_default.rs

@@ -1,10 +1,10 @@
-use rustc::hir::def_id::DefId;
-use rustc::hir;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::def_id::DefId;
+use crate::rustc::hir;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass, in_external_macro, LintContext};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
-use syntax::source_map::Span;
+use crate::rustc::ty::{self, Ty};
+use crate::syntax::source_map::Span;
 use crate::utils::paths;
 use crate::utils::{get_trait_def_id, implements_trait, return_ty, same_tys, span_lint_and_then};
 use crate::utils::sugg::DiagnosticBuilderExt;

clippy_lints/src/no_effect.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::def::Def;
-use rustc::hir::{BinOpKind, BlockCheckMode, Expr, ExprKind, Stmt, StmtKind, UnsafeSource};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::def::Def;
+use crate::rustc::hir::{BinOpKind, BlockCheckMode, Expr, ExprKind, Stmt, StmtKind, UnsafeSource};
 use crate::utils::{has_drop, in_macro, snippet_opt, span_lint, span_lint_and_sugg};
 use std::ops::Deref;
 

clippy_lints/src/non_copy_const.rs

@@ -2,15 +2,15 @@
 //!
 //! This lint is **deny** by default.
 
-use rustc::lint::{LateContext, LateLintPass, Lint, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc::hir::*;
-use rustc::hir::def::Def;
-use rustc::ty::{self, TypeFlags};
-use rustc::ty::adjustment::Adjust;
-use rustc_errors::Applicability;
-use rustc_typeck::hir_ty_to_ty;
-use syntax_pos::{DUMMY_SP, Span};
+use crate::rustc::lint::{LateContext, LateLintPass, Lint, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::def::Def;
+use crate::rustc::ty::{self, TypeFlags};
+use crate::rustc::ty::adjustment::Adjust;
+use crate::rustc_errors::Applicability;
+use crate::rustc_typeck::hir_ty_to_ty;
+use crate::syntax_pos::{DUMMY_SP, Span};
 use std::ptr;
 use crate::utils::{in_constant, in_macro, is_copy, span_lint_and_then};
 

clippy_lints/src/non_expressive_names.rs

@@ -1,10 +1,10 @@
-use rustc::lint::{LintArray, LintPass, EarlyContext, EarlyLintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::source_map::Span;
-use syntax::symbol::LocalInternedString;
-use syntax::ast::*;
-use syntax::attr;
-use syntax::visit::{walk_block, walk_expr, walk_pat, Visitor};
+use crate::rustc::lint::{LintArray, LintPass, EarlyContext, EarlyLintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::source_map::Span;
+use crate::syntax::symbol::LocalInternedString;
+use crate::syntax::ast::*;
+use crate::syntax::attr;
+use crate::syntax::visit::{walk_block, walk_expr, walk_pat, Visitor};
 use crate::utils::{span_lint, span_lint_and_then};
 
 /// **What it does:** Checks for names that are very similar and thus confusing.

clippy_lints/src/ok_if_let.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::*;
+use crate::rustc::hir::*;
 use crate::utils::{match_type, method_chain_args, paths, snippet, span_help_and_lint};
 
 /// **What it does:*** Checks for unnecessary `ok()` in if let.

clippy_lints/src/open_options.rs

@@ -1,8 +1,8 @@
-use rustc::hir::{Expr, ExprKind};
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::LitKind;
-use syntax::source_map::{Span, Spanned};
+use crate::rustc::hir::{Expr, ExprKind};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::LitKind;
+use crate::syntax::source_map::{Span, Spanned};
 use crate::utils::{match_type, paths, span_lint, walk_ptrs_ty};
 
 /// **What it does:** Checks for duplicate open options as well as combinations

clippy_lints/src/overflow_check_conditional.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::*;
+use crate::rustc::hir::*;
 use crate::utils::{span_lint, SpanlessEq};
 
 /// **What it does:** Detects classic underflow/overflow checks.

clippy_lints/src/panic_unimplemented.rs

@@ -1,10 +1,10 @@
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use syntax::ast::LitKind;
-use syntax::ptr::P;
-use syntax::ext::quote::rt::Span;
+use crate::syntax::ast::LitKind;
+use crate::syntax::ptr::P;
+use crate::syntax::ext::quote::rt::Span;
 use crate::utils::{is_direct_expn_of, is_expn_of, match_def_path, opt_def_id, paths, resolve_node, span_lint};
 
 /// **What it does:** Checks for missing parameters in `panic!`.

clippy_lints/src/partialeq_ne_impl.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::*;
+use crate::rustc::hir::*;
 use crate::utils::{is_automatically_derived, span_lint};
 
 /// **What it does:** Checks for manual re-implementations of `PartialEq::ne`.

clippy_lints/src/precedence.rs

@@ -1,7 +1,7 @@
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
-use syntax::source_map::Spanned;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
+use crate::syntax::source_map::Spanned;
 use crate::utils::{in_macro, snippet, span_lint_and_sugg};
 
 /// **What it does:** Checks for operations where precedence may be unclear
@@ -121,7 +121,7 @@ fn is_arith_expr(expr: &Expr) -> bool {
 }
 
 fn is_bit_op(op: BinOpKind) -> bool {
-    use syntax::ast::BinOpKind::*;
+    use crate::syntax::ast::BinOpKind::*;
     match op {
         BitXor | BitAnd | BitOr | Shl | Shr => true,
         _ => false,
@@ -129,7 +129,7 @@ fn is_bit_op(op: BinOpKind) -> bool {
 }
 
 fn is_arith_op(op: BinOpKind) -> bool {
-    use syntax::ast::BinOpKind::*;
+    use crate::syntax::ast::BinOpKind::*;
     match op {
         Add | Sub | Mul | Div | Rem => true,
         _ => false,

clippy_lints/src/ptr.rs

@@ -1,15 +1,15 @@
 //! Checks for usage of  `&Vec[_]` and `&String`.
 
 use std::borrow::Cow;
-use rustc::hir::*;
-use rustc::hir::QPath;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::hir::*;
+use crate::rustc::hir::QPath;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::ty;
-use syntax::ast::NodeId;
-use syntax::source_map::Span;
-use syntax_pos::MultiSpan;
+use crate::rustc::ty;
+use crate::syntax::ast::NodeId;
+use crate::syntax::source_map::Span;
+use crate::syntax_pos::MultiSpan;
 use crate::utils::{match_qpath, match_type, paths, snippet_opt, span_lint, span_lint_and_then, walk_ptrs_hir_ty};
 use crate::utils::ptr::get_spans;
 

clippy_lints/src/ptr_offset_with_cast.rs

@@ -1,4 +1,4 @@
-use rustc::{declare_tool_lint, hir, lint, lint_array};
+use crate::rustc::{declare_tool_lint, hir, lint, lint_array};
 use crate::utils;
 use std::fmt;
 

clippy_lints/src/question_mark.rs

@@ -1,10 +1,10 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::*;
-use rustc::hir::def::Def;
+use crate::rustc::hir::*;
+use crate::rustc::hir::def::Def;
 use crate::utils::sugg::Sugg;
-use syntax::ptr::P;
+use crate::syntax::ptr::P;
 
 use crate::utils::{match_def_path, match_type, span_lint_and_then};
 use crate::utils::paths::*;

clippy_lints/src/ranges.rs

@@ -1,9 +1,9 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir::*;
-use syntax::ast::RangeLimits;
-use syntax::source_map::Spanned;
+use crate::rustc::hir::*;
+use crate::syntax::ast::RangeLimits;
+use crate::syntax::source_map::Spanned;
 use crate::utils::{is_integer_literal, paths, snippet, span_lint, span_lint_and_then, snippet_opt};
 use crate::utils::{get_trait_def_id, higher, implements_trait, SpanlessEq};
 use crate::utils::sugg::Sugg;

clippy_lints/src/redundant_field_names.rs

@@ -1,6 +1,6 @@
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use syntax::ast::*;
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::*;
 use crate::utils::{span_lint_and_sugg};
 
 /// **What it does:** Checks for fields in struct literals where shorthands

clippy_lints/src/reference.rs

@@ -1,6 +1,6 @@
-use syntax::ast::{Expr, ExprKind, UnOp};
-use rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::syntax::ast::{Expr, ExprKind, UnOp};
+use crate::rustc::lint::{EarlyContext, EarlyLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
 use crate::utils::{snippet, span_lint_and_sugg};
 

clippy_lints/src/regex.rs

@@ -1,11 +1,11 @@
 use regex_syntax;
-use rustc::hir::*;
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
-use rustc_data_structures::fx::FxHashSet;
+use crate::rustc::hir::*;
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
+use crate::rustc_data_structures::fx::FxHashSet;
 use if_chain::if_chain;
-use syntax::ast::{LitKind, NodeId, StrStyle};
-use syntax::source_map::{BytePos, Span};
+use crate::syntax::ast::{LitKind, NodeId, StrStyle};
+use crate::syntax::source_map::{BytePos, Span};
 use crate::utils::{is_expn_of, match_def_path, match_type, opt_def_id, paths, span_help_and_lint, span_lint};
 use crate::consts::{constant, Constant};
 

clippy_lints/src/replace_consts.rs

@@ -1,8 +1,8 @@
-use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_tool_lint, lint_array};
+use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
+use crate::rustc::{declare_tool_lint, lint_array};
 use if_chain::if_chain;
-use rustc::hir;
-use rustc::hir::def::Def;
+use crate::rustc::hir;
+use crate::rustc::hir::def::Def;
 use crate::utils::{match_def_path, span_lint_and_sugg};
 
 /// **What it does:** Checks for usage of `ATOMIC_X_INIT`, `ONCE_INIT`, and