match lowering cleanup: `non_scalar_compare` is only for `&str`

Since array and slice constants are now lowered to array and slice
patterns, `non_scalar_compare` was only called for string comparisons.
This specializes it to strings, renames it, and removes the unused
array-unsizing logic.

This also updates some outdated doc comments.

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler/rustc_middle/src/thir.rs b/compiler/rustc_middle/src/thir.rs
index bbcd509c558..6783bbf8bf4 100644
--- a/compiler/rustc_middle/src/thir.rs
+++ b/compiler/rustc_middle/src/thir.rs
@@ -800,9 +800,9 @@ pub enum PatKind<'tcx> {
     },
 
     /// One of the following:
-    /// * `&str`/`&[u8]` (represented as a valtree), which will be handled as a string/slice pattern
-    ///   and thus exhaustiveness checking will detect if you use the same string/slice twice in
-    ///   different patterns.
+    /// * `&str` (represented as a valtree), which will be handled as a string pattern and thus
+    ///   exhaustiveness checking will detect if you use the same string twice in different
+    ///   patterns.
     /// * integer, bool, char or float (represented as a valtree), which will be handled by
     ///   exhaustiveness to cover exactly its own value, similar to `&str`, but these values are
     ///   much simpler.