Use diagnostic items for Vec, VecDeque and connected refactorings

clippy_lints/src/infinite_iter.rs

@@ -1,9 +1,10 @@
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::ty::{implements_trait, match_type};
+use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
 use clippy_utils::{get_trait_def_id, higher, is_qpath_def_path, paths};
 use rustc_hir::{BorrowKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::{sym, Symbol};
 
 declare_clippy_lint! {
     /// **What it does:** Checks for iteration that is guaranteed to be infinite.
@@ -202,15 +203,15 @@ const COMPLETING_METHODS: [(&str, usize); 12] = [
 ];
 
 /// the paths of types that are known to be infinitely allocating
-const INFINITE_COLLECTORS: [&[&str]; 8] = [
-    &paths::BINARY_HEAP,
-    &paths::BTREEMAP,
-    &paths::BTREESET,
-    &paths::HASHMAP,
-    &paths::HASHSET,
-    &paths::LINKED_LIST,
-    &paths::VEC,
-    &paths::VEC_DEQUE,
+const INFINITE_COLLECTORS: &[Symbol] = &[
+    sym::BinaryHeap,
+    sym::BTreeMap,
+    sym::BTreeSet,
+    sym::hashmap_type,
+    sym::hashset_type,
+    sym::LinkedList,
+    sym::vec_type,
+    sym::vecdeque_type,
 ];
 
 fn complete_infinite_iter(cx: &LateContext<'_>, expr: &Expr<'_>) -> Finiteness {
@@ -235,7 +236,10 @@ fn complete_infinite_iter(cx: &LateContext<'_>, expr: &Expr<'_>) -> Finiteness {
                 }
             } else if method.ident.name == sym!(collect) {
                 let ty = cx.typeck_results().expr_ty(expr);
-                if INFINITE_COLLECTORS.iter().any(|path| match_type(cx, ty, path)) {
+                if INFINITE_COLLECTORS
+                    .iter()
+                    .any(|diag_item| is_type_diagnostic_item(cx, ty, *diag_item))
+                {
                     return is_infinite(cx, &args[0]);
                 }
             }

clippy_lints/src/size_of_in_element_count.rs

@@ -67,7 +67,7 @@ fn get_pointee_ty_and_count_expr(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -
     const FUNCTIONS: [&[&str]; 8] = [
         &paths::PTR_COPY_NONOVERLAPPING,
         &paths::PTR_COPY,
-        &paths::WRITE_BYTES,
+        &paths::PTR_WRITE_BYTES,
         &paths::PTR_SWAP_NONOVERLAPPING,
         &paths::PTR_SLICE_FROM_RAW_PARTS,
         &paths::PTR_SLICE_FROM_RAW_PARTS_MUT,

clippy_lints/src/transmute/unsound_collection_transmute.rs

@@ -1,20 +1,21 @@
 use super::utils::is_layout_incompatible;
 use super::UNSOUND_COLLECTION_TRANSMUTE;
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::{match_def_path, paths};
+use clippy_utils::match_any_diagnostic_items;
 use rustc_hir::Expr;
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, Ty};
+use rustc_span::symbol::{sym, Symbol};
 
 // used to check for UNSOUND_COLLECTION_TRANSMUTE
-static COLLECTIONS: &[&[&str]] = &[
-    &paths::VEC,
-    &paths::VEC_DEQUE,
-    &paths::BINARY_HEAP,
-    &paths::BTREESET,
-    &paths::BTREEMAP,
-    &paths::HASHSET,
-    &paths::HASHMAP,
+static COLLECTIONS: &[Symbol] = &[
+    sym::vec_type,
+    sym::vecdeque_type,
+    sym::BinaryHeap,
+    sym::BTreeSet,
+    sym::BTreeMap,
+    sym::hashset_type,
+    sym::hashmap_type,
 ];
 
 /// Checks for `unsound_collection_transmute` lint.
@@ -22,7 +23,7 @@ static COLLECTIONS: &[&[&str]] = &[
 pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, from_ty: Ty<'tcx>, to_ty: Ty<'tcx>) -> bool {
     match (&from_ty.kind(), &to_ty.kind()) {
         (ty::Adt(from_adt, from_substs), ty::Adt(to_adt, to_substs)) => {
-            if from_adt.did != to_adt.did || !COLLECTIONS.iter().any(|path| match_def_path(cx, to_adt.did, path)) {
+            if from_adt.did != to_adt.did || match_any_diagnostic_items(cx, to_adt.did, COLLECTIONS).is_none() {
                 return false;
             }
             if from_substs

clippy_utils/src/paths.rs

@@ -21,17 +21,11 @@ pub const ASMUT_TRAIT: [&str; 3] = ["core", "convert", "AsMut"];
 pub const ASREF_TRAIT: [&str; 3] = ["core", "convert", "AsRef"];
 pub(super) const BEGIN_PANIC: [&str; 3] = ["std", "panicking", "begin_panic"];
 pub(super) const BEGIN_PANIC_FMT: [&str; 3] = ["std", "panicking", "begin_panic_fmt"];
-/// Preferably use the diagnostic item `sym::BinaryHeap` where possible
-pub const BINARY_HEAP: [&str; 4] = ["alloc", "collections", "binary_heap", "BinaryHeap"];
 /// Preferably use the diagnostic item `sym::Borrow` where possible
 pub const BORROW_TRAIT: [&str; 3] = ["core", "borrow", "Borrow"];
-/// Preferably use the diagnostic item `sym::BTreeMap` where possible
-pub const BTREEMAP: [&str; 5] = ["alloc", "collections", "btree", "map", "BTreeMap"];
 pub const BTREEMAP_CONTAINS_KEY: [&str; 6] = ["alloc", "collections", "btree", "map", "BTreeMap", "contains_key"];
 pub const BTREEMAP_ENTRY: [&str; 6] = ["alloc", "collections", "btree", "map", "entry", "Entry"];
 pub const BTREEMAP_INSERT: [&str; 6] = ["alloc", "collections", "btree", "map", "BTreeMap", "insert"];
-/// Preferably use the diagnostic item `sym::BTreeSet` where possible
-pub const BTREESET: [&str; 5] = ["alloc", "collections", "btree", "set", "BTreeSet"];
 pub const CLONE_TRAIT_METHOD: [&str; 4] = ["core", "clone", "Clone", "clone"];
 pub const CMP_MAX: [&str; 3] = ["core", "cmp", "max"];
 pub const CMP_MIN: [&str; 3] = ["core", "cmp", "min"];
@@ -59,13 +53,9 @@ pub const FROM_ITERATOR_METHOD: [&str; 6] = ["core", "iter", "traits", "collect"
 pub const FROM_STR_METHOD: [&str; 5] = ["core", "str", "traits", "FromStr", "from_str"];
 pub const FUTURE_FROM_GENERATOR: [&str; 3] = ["core", "future", "from_generator"];
 pub const HASH: [&str; 3] = ["core", "hash", "Hash"];
-/// Preferably use the diagnostic item `sym::hashmap_type` where possible
-pub const HASHMAP: [&str; 5] = ["std", "collections", "hash", "map", "HashMap"];
 pub const HASHMAP_CONTAINS_KEY: [&str; 6] = ["std", "collections", "hash", "map", "HashMap", "contains_key"];
 pub const HASHMAP_ENTRY: [&str; 5] = ["std", "collections", "hash", "map", "Entry"];
 pub const HASHMAP_INSERT: [&str; 6] = ["std", "collections", "hash", "map", "HashMap", "insert"];
-/// Preferably use the diagnostic item `sym::hashset_type` where possible
-pub const HASHSET: [&str; 5] = ["std", "collections", "hash", "set", "HashSet"];
 #[cfg(feature = "internal-lints")]
 pub const IDENT: [&str; 3] = ["rustc_span", "symbol", "Ident"];
 #[cfg(feature = "internal-lints")]
@@ -83,8 +73,6 @@ pub const KW_MODULE: [&str; 3] = ["rustc_span", "symbol", "kw"];
 #[cfg(feature = "internal-lints")]
 pub const LATE_CONTEXT: [&str; 2] = ["rustc_lint", "LateContext"];
 pub const LIBC_STRLEN: [&str; 2] = ["libc", "strlen"];
-/// Preferably use the diagnostic item `sym::LinkedList` where possible
-pub const LINKED_LIST: [&str; 4] = ["alloc", "collections", "linked_list", "LinkedList"];
 #[cfg(any(feature = "internal-lints", feature = "metadata-collector-lint"))]
 pub const LINT: [&str; 2] = ["rustc_lint_defs", "Lint"];
 pub const MEM_DISCRIMINANT: [&str; 3] = ["core", "mem", "discriminant"];
@@ -182,14 +170,10 @@ pub const SYNTAX_CONTEXT: [&str; 3] = ["rustc_span", "hygiene", "SyntaxContext"]
 pub const TO_OWNED_METHOD: [&str; 4] = ["alloc", "borrow", "ToOwned", "to_owned"];
 pub const TO_STRING_METHOD: [&str; 4] = ["alloc", "string", "ToString", "to_string"];
 pub const TRY_FROM: [&str; 4] = ["core", "convert", "TryFrom", "try_from"];
-
-pub const VEC: [&str; 3] = ["alloc", "vec", "Vec"];
 pub const VEC_AS_MUT_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_mut_slice"];
 pub const VEC_AS_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_slice"];
-pub const VEC_DEQUE: [&str; 4] = ["alloc", "collections", "vec_deque", "VecDeque"];
 pub const VEC_FROM_ELEM: [&str; 3] = ["alloc", "vec", "from_elem"];
 pub const VEC_NEW: [&str; 4] = ["alloc", "vec", "Vec", "new"];
 pub const VEC_RESIZE: [&str; 4] = ["alloc", "vec", "Vec", "resize"];
 pub const WEAK_ARC: [&str; 3] = ["alloc", "sync", "Weak"];
 pub const WEAK_RC: [&str; 3] = ["alloc", "rc", "Weak"];
-pub const WRITE_BYTES: [&str; 3] = ["core", "intrinsics", "write_bytes"];

tests/ui-internal/match_type_on_diag_item.rs

@@ -27,7 +27,6 @@ impl<'tcx> LateLintPass<'tcx> for Pass {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr) {
         let ty = cx.typeck_results().expr_ty(expr);
 
-        let _ = match_type(cx, ty, &paths::VEC); // FIXME: Doesn't lint external paths
         let _ = match_type(cx, ty, &OPTION);
         let _ = match_type(cx, ty, &["core", "result", "Result"]);
 

tests/ui-internal/match_type_on_diag_item.stderr

@@ -1,5 +1,5 @@
 error: usage of `clippy_utils::ty::match_type()` on a type diagnostic item
-  --> $DIR/match_type_on_diag_item.rs:31:17
+  --> $DIR/match_type_on_diag_item.rs:30:17
    |
 LL |         let _ = match_type(cx, ty, &OPTION);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `clippy_utils::ty::is_type_diagnostic_item(cx, ty, sym::option_type)`
@@ -12,13 +12,13 @@ LL | #![deny(clippy::internal)]
    = note: `#[deny(clippy::match_type_on_diagnostic_item)]` implied by `#[deny(clippy::internal)]`
 
 error: usage of `clippy_utils::ty::match_type()` on a type diagnostic item
-  --> $DIR/match_type_on_diag_item.rs:32:17
+  --> $DIR/match_type_on_diag_item.rs:31:17
    |
 LL |         let _ = match_type(cx, ty, &["core", "result", "Result"]);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `clippy_utils::ty::is_type_diagnostic_item(cx, ty, sym::result_type)`
 
 error: usage of `clippy_utils::ty::match_type()` on a type diagnostic item
-  --> $DIR/match_type_on_diag_item.rs:35:17
+  --> $DIR/match_type_on_diag_item.rs:34:17
    |
 LL |         let _ = clippy_utils::ty::match_type(cx, ty, rc_path);
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `clippy_utils::ty::is_type_diagnostic_item(cx, ty, sym::Rc)`