slice_patterns: organize some tests

src/test/ui/array-slice-vec/slice-pat-type-mismatches.stderr

@@ -1,29 +1,29 @@
 error[E0425]: cannot find value `does_not_exist` in this scope
-  --> $DIR/match-vec-mismatch.rs:26:11
+  --> $DIR/slice-pat-type-mismatches.rs:26:11
    |
 LL |     match does_not_exist {
    |           ^^^^^^^^^^^^^^ not found in this scope
 
 error[E0529]: expected an array or slice, found `std::string::String`
-  --> $DIR/match-vec-mismatch.rs:3:9
+  --> $DIR/slice-pat-type-mismatches.rs:3:9
    |
 LL |         ['f', 'o', ..] => {}
    |         ^^^^^^^^^^^^^^ pattern cannot match with input type `std::string::String`
 
 error[E0527]: pattern requires 1 element but array has 3
-  --> $DIR/match-vec-mismatch.rs:18:9
+  --> $DIR/slice-pat-type-mismatches.rs:18:9
    |
 LL |         [0] => {},
    |         ^^^ expected 3 elements
 
 error[E0528]: pattern requires at least 4 elements but array has 3
-  --> $DIR/match-vec-mismatch.rs:23:9
+  --> $DIR/slice-pat-type-mismatches.rs:23:9
    |
 LL |         [0, 1, 2, 3, x @ ..] => {}
    |         ^^^^^^^^^^^^^^^^^^^^ pattern cannot match array of 3 elements
 
 error[E0282]: type annotations needed
-  --> $DIR/match-vec-mismatch.rs:34:9
+  --> $DIR/slice-pat-type-mismatches.rs:34:9
    |
 LL |         [] => {}
    |         ^^ cannot infer type

src/test/ui/array-slice-vec/subslice-only-once-semantic-restriction.stderr

@@ -1,11 +1,11 @@
 error[E0416]: identifier `tail` is bound more than once in the same pattern
-  --> $DIR/match-vec-invalid.rs:4:24
+  --> $DIR/subslice-only-once-semantic-restriction.rs:4:24
    |
 LL |         [1, tail @ .., tail @ ..] => {},
    |                        ^^^^ used in a pattern more than once
 
 error: `..` can only be used once per slice pattern
-  --> $DIR/match-vec-invalid.rs:4:31
+  --> $DIR/subslice-only-once-semantic-restriction.rs:4:31
    |
 LL |         [1, tail @ .., tail @ ..] => {},
    |                    --         ^^ can only be used once per slice pattern
@@ -13,7 +13,7 @@ LL |         [1, tail @ .., tail @ ..] => {},
    |                    previously used here
 
 error[E0308]: mismatched types
-  --> $DIR/match-vec-invalid.rs:11:30
+  --> $DIR/subslice-only-once-semantic-restriction.rs:11:30
    |
 LL | const RECOVERY_WITNESS: () = 0;
    |                              ^ expected `()`, found integer

src/test/ui/pattern/usefulness/issue-53820-slice-pattern-large-array.rs

@@ -1,6 +1,6 @@
 // check-pass
 
-// This used to cause a stack overflow in the compiler.
+// This used to cause a stack overflow during exhaustiveness checking in the compiler.
 
 fn main() {
     const LARGE_SIZE: usize = 1024 * 1024;