Merge remote-tracking branch 'upstream/master' into rustup

[rust.git] / clippy_lints / src / mut_key.rs

diff --git a/clippy_lints/src/mut_key.rs b/clippy_lints/src/mut_key.rs
index 0826ad0ab55bb01c150449579135fa158d88676a..11044e0c2fb487bab154c72fac101619445a9cea 100644 (file)
--- a/clippy_lints/src/mut_key.rs
+++ b/clippy_lints/src/mut_key.rs
@@ -1,6 +1,7 @@
-use crate::utils::{match_def_path, paths, span_lint, trait_ref_of_method, walk_ptrs_ty};
+use crate::utils::{match_def_path, paths, span_lint, trait_ref_of_method};
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::TypeFoldable;
 use rustc_middle::ty::{Adt, Array, RawPtr, Ref, Slice, Tuple, Ty, TypeAndMut};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
@@ -88,17 +89,13 @@ fn check_sig<'tcx>(cx: &LateContext<'tcx>, item_hir_id: hir::HirId, decl: &hir::
     for (hir_ty, ty) in decl.inputs.iter().zip(fn_sig.inputs().skip_binder().iter()) {
         check_ty(cx, hir_ty.span, ty);
     }
-    check_ty(
-        cx,
-        decl.output.span(),
-        cx.tcx.erase_late_bound_regions(&fn_sig.output()),
-    );
+    check_ty(cx, decl.output.span(), cx.tcx.erase_late_bound_regions(fn_sig.output()));
 }
 
 // We want to lint 1. sets or maps with 2. not immutable key types and 3. no unerased
 // generics (because the compiler cannot ensure immutability for unknown types).
 fn check_ty<'tcx>(cx: &LateContext<'tcx>, span: Span, ty: Ty<'tcx>) {
-    let ty = walk_ptrs_ty(ty);
+    let ty = ty.peel_refs();
     if let Adt(def, substs) = ty.kind() {
         if [&paths::HASHMAP, &paths::BTREEMAP, &paths::HASHSET, &paths::BTREESET]
             .iter()
@@ -120,7 +117,11 @@ fn is_mutable_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, span: Span) -> bo
             size.try_eval_usize(cx.tcx, cx.param_env).map_or(true, |u| u != 0) && is_mutable_type(cx, inner_ty, span)
         },
         Tuple(..) => ty.tuple_fields().any(|ty| is_mutable_type(cx, ty, span)),
-        Adt(..) => cx.tcx.layout_of(cx.param_env.and(ty)).is_ok() && !ty.is_freeze(cx.tcx.at(span), cx.param_env),
+        Adt(..) => {
+            cx.tcx.layout_of(cx.param_env.and(ty)).is_ok()
+                && !ty.has_escaping_bound_vars()
+                && !ty.is_freeze(cx.tcx.at(span), cx.param_env)
+        },
         _ => false,
     }
 }