Cleanups

crates/hir/src/diagnostics.rs

@@ -5,7 +5,7 @@
 //! be expressed in terms of hir types themselves.
 use cfg::{CfgExpr, CfgOptions};
 use either::Either;
-use hir_def::{path::ModPath, type_ref::Mutability};
+use hir_def::path::ModPath;
 use hir_expand::{name::Name, HirFileId, InFile};
 use syntax::{ast, AstPtr, SyntaxNodePtr, TextRange};
 

crates/hir/src/lib.rs

@@ -58,7 +58,6 @@ use hir_ty::{
     consteval::{
         eval_const, unknown_const_as_generic, ComputedExpr, ConstEvalCtx, ConstEvalError, ConstExt,
     },
-    could_unify,
     diagnostics::BodyValidationDiagnostic,
     method_resolution::{self, TyFingerprint},
     primitive::UintTy,
@@ -1014,9 +1013,7 @@ impl Adt {
                 let r = it.next().unwrap_or_else(|| TyKind::Error.intern(Interner));
                 match x {
                     ParamKind::Type => GenericArgData::Ty(r).intern(Interner),
-                    ParamKind::Const(ty) => {
+                    ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),
-                        unknown_const_as_generic(ty.clone())
-                    }
                 }
             })
             .build();
@@ -1329,7 +1326,6 @@ impl DefWithBody {
                         Err(SyntheticSyntax) => (),
                     }
                 }
-                _ => {} // TODO fixme
             }
         }
 
@@ -2644,11 +2640,14 @@ impl Type {
     }
 
     pub fn reference(inner: &Type, m: Mutability) -> Type {
-        inner.derived(TyKind::Ref(
+        inner.derived(
+            TyKind::Ref(
                 if m.is_mut() { hir_ty::Mutability::Mut } else { hir_ty::Mutability::Not },
                 hir_ty::static_lifetime(),
                 inner.ty.clone(),
-        ).intern(Interner))
+            )
+            .intern(Interner),
+        )
     }
 
     fn new(db: &dyn HirDatabase, krate: CrateId, lexical_env: impl HasResolver, ty: Ty) -> Type {

crates/hir_ty/src/diagnostics/expr.rs

@@ -4,10 +4,7 @@
 
 use std::sync::Arc;
 
-use hir_def::{
+use hir_def::{path::path, resolver::HasResolver, AssocItemId, DefWithBodyId, HasModule};
-    expr::Statement, path::path, resolver::HasResolver, type_ref::Mutability, AssocItemId,
-    DefWithBodyId, HasModule,
-};
 use hir_expand::name;
 use itertools::Either;
 use rustc_hash::FxHashSet;
@@ -20,7 +17,7 @@ use crate::{
         deconstruct_pat::DeconstructedPat,
         usefulness::{compute_match_usefulness, MatchCheckCtx},
     },
-    AdtId, InferenceResult, Interner, Ty, TyExt, TyKind,
+    InferenceResult, Interner, TyExt,
 };
 
 pub(crate) use hir_def::{
@@ -428,30 +425,3 @@ fn types_of_subpatterns_do_match(pat: PatId, body: &Body, infer: &InferenceResul
     walk(pat, body, infer, &mut has_type_mismatches);
     !has_type_mismatches
 }
-
-fn check_missing_refs(
-    infer: &InferenceResult,
-    arg: ExprId,
-    param: &Ty,
-) -> Option<(ExprId, Mutability)> {
-    let arg_ty = infer.type_of_expr.get(arg)?;
-
-    let reference_one = arg_ty.as_reference();
-    let reference_two = param.as_reference();
-
-    match (reference_one, reference_two) {
-        (None, Some((referenced_ty, _, mutability))) if referenced_ty == arg_ty => {
-            Some((arg, Mutability::from_mutable(matches!(mutability, chalk_ir::Mutability::Mut))))
-        }
-        (None, Some((referenced_ty, _, mutability))) => match referenced_ty.kind(Interner) {
-            TyKind::Slice(subst) if matches!(arg_ty.kind(Interner), TyKind::Array(arr_subst, _) if arr_subst == subst) => {
-                Some((
-                    arg,
-                    Mutability::from_mutable(matches!(mutability, chalk_ir::Mutability::Mut)),
-                ))
-            }
-            _ => None,
-        },
-        _ => None,
-    }
-}

crates/hir_ty/src/infer.rs

@@ -43,9 +43,9 @@ use crate::{
 // This lint has a false positive here. See the link below for details.
 //
 // https://github.com/rust-lang/rust/issues/57411
+pub use coerce::could_coerce;
 #[allow(unreachable_pub)]
 pub use unify::could_unify;
-pub use coerce::could_coerce;
 
 pub(crate) mod unify;
 mod path;

crates/hir_ty/src/infer/coerce.rs

@@ -7,19 +7,20 @@
 
 use std::{iter, sync::Arc};
 
-use chalk_ir::{cast::Cast, Goal, Mutability, TyVariableKind, BoundVar};
+use chalk_ir::{cast::Cast, BoundVar, Goal, Mutability, TyVariableKind};
 use hir_def::{expr::ExprId, lang_item::LangItemTarget};
 use stdx::always;
 use syntax::SmolStr;
 
 use crate::{
     autoderef::{Autoderef, AutoderefKind},
+    db::HirDatabase,
     infer::{
-        Adjust, Adjustment, AutoBorrow, InferOk, InferResult, InferenceContext, OverloadedDeref,
+        Adjust, Adjustment, AutoBorrow, InferOk, InferenceContext, OverloadedDeref, PointerCast,
-        PointerCast, TypeError, TypeMismatch,
+        TypeError, TypeMismatch,
     },
     static_lifetime, Canonical, DomainGoal, FnPointer, FnSig, Guidance, InEnvironment, Interner,
-    Solution, Substitution, Ty, TyBuilder, TyExt, TyKind, db::HirDatabase, TraitEnvironment, GenericArgData,
+    Solution, Substitution, TraitEnvironment, Ty, TyBuilder, TyExt, TyKind,
 };
 
 use super::unify::InferenceTable;

crates/hir_ty/src/infer/unify.rs

@@ -3,8 +3,8 @@
 use std::{fmt, mem, sync::Arc};
 
 use chalk_ir::{
-    cast::Cast, fold::Fold, interner::HasInterner, zip::Zip, FloatTy, IntTy, NoSolution,
+    cast::Cast, fold::Fold, interner::HasInterner, zip::Zip, CanonicalVarKind, FloatTy, IntTy,
-    TyVariableKind, UniverseIndex, CanonicalVarKind,
+    NoSolution, TyVariableKind, UniverseIndex,
 };
 use chalk_solve::infer::ParameterEnaVariableExt;
 use ena::unify::UnifyKey;
@@ -299,14 +299,12 @@ impl<'a> InferenceTable<'a> {
         self.resolve_with_fallback_inner(&mut Vec::new(), t, &fallback)
     }
 
-    pub(crate) fn fresh_subst(
+    pub(crate) fn fresh_subst(&mut self, binders: &[CanonicalVarKind<Interner>]) -> Substitution {
-        &mut self,
-        binders: &[CanonicalVarKind<Interner>],
-    ) -> Substitution {
         Substitution::from_iter(
             Interner,
             binders.iter().map(|kind| {
-                let param_infer_var = kind.map_ref(|&ui| self.var_unification_table.new_variable(ui));
+                let param_infer_var =
+                    kind.map_ref(|&ui| self.var_unification_table.new_variable(ui));
                 param_infer_var.to_generic_arg(Interner)
             }),
         )

crates/ide_diagnostics/src/handlers/type_mismatch.rs

@@ -1,13 +1,11 @@
 use hir::{db::AstDatabase, HirDisplay, Type, TypeInfo};
 use ide_db::{
-    base_db::{FileLoader, FileRange},
+    famous_defs::FamousDefs, source_change::SourceChange,
-    famous_defs::FamousDefs,
-    source_change::SourceChange,
     syntax_helpers::node_ext::for_each_tail_expr,
 };
 use syntax::{
     ast::{BlockExpr, ExprStmt},
-    AstNode, TextRange, TextSize,
+    AstNode,
 };
 use text_edit::TextEdit;