X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=clippy_lints%2Fsrc%2Fmethods%2Futils.rs;h=11ad881ee7b95bf1d29b58b89111e85a58b575b7;hb=3c8f90bd5a03872a9b9088facc3bf9ec8ac42dd0;hp=f6bf37e08b96614007217d910fe0778d3c8ffa6b;hpb=f6d1f368db9e726fde825dc2525cdec07673b416;p=rust.git

diff --git a/clippy_lints/src/methods/utils.rs b/clippy_lints/src/methods/utils.rs
index f6bf37e08b9..11ad881ee7b 100644
--- a/clippy_lints/src/methods/utils.rs
+++ b/clippy_lints/src/methods/utils.rs
@@ -17,18 +17,16 @@ fn may_slice<'a>(cx: &LateContext<'a>, ty: Ty<'a>) -> bool {
         match ty.kind() {
             ty::Slice(_) => true,
             ty::Adt(def, _) if def.is_box() => may_slice(cx, ty.boxed_ty()),
-            ty::Adt(..) => is_type_diagnostic_item(cx, ty, sym::vec_type),
-            ty::Array(_, size) => size
-                .try_eval_usize(cx.tcx, cx.param_env)
-                .map_or(false, |size| size < 32),
+            ty::Adt(..) => is_type_diagnostic_item(cx, ty, sym::Vec),
+            ty::Array(_, size) => size.try_eval_usize(cx.tcx, cx.param_env).is_some(),
             ty::Ref(_, inner, _) => may_slice(cx, inner),
             _ => false,
         }
     }
 
-    if let hir::ExprKind::MethodCall(path, _, args, _) = expr.kind {
-        if path.ident.name == sym::iter && may_slice(cx, cx.typeck_results().expr_ty(&args[0])) {
-            Some(&args[0])
+    if let hir::ExprKind::MethodCall(path, _, [self_arg, ..], _) = &expr.kind {
+        if path.ident.name == sym::iter && may_slice(cx, cx.typeck_results().expr_ty(self_arg)) {
+            Some(self_arg)
         } else {
             None
         }
@@ -68,7 +66,13 @@ pub(super) fn get_hint_if_single_char_arg(
                 // for regular string: "a"
                 &snip[1..(snip.len() - 1)]
             };
-            let hint = format!("'{}'", if ch == "'" { "\\'" } else { ch });
+
+            let hint = format!("'{}'", match ch {
+                "'" => "\\'" ,
+                r"\" => "\\\\",
+                _ => ch,
+            });
+
             Some(hint)
         } else {
             None