Rollup merge of #70424 - lcnr:nit, r=Centril

simplify match stmt

We actually have a surprising amount of
```rust
match expr {
    $($p:pat)|+ => true,
    _ => false,
}
```
While I would prefer this to be replaced with `matches!`, most cases are
fairly readable anyway so we can just let them be for now.

1 files changed, 1 insertions, 5 deletions

diff --git a/src/librustc_ast_passes/ast_validation.rs b/src/librustc_ast_passes/ast_validation.rs
index c03c44fc634..d6d1153f279 100644
--- a/src/librustc_ast_passes/ast_validation.rs
+++ b/src/librustc_ast_passes/ast_validation.rs
@@ -289,11 +289,7 @@ impl<'a> AstValidator<'a> {
         match expr.kind {
             ExprKind::Lit(..) | ExprKind::Err => {}
             ExprKind::Path(..) if allow_paths => {}
-            ExprKind::Unary(UnOp::Neg, ref inner)
-                if match inner.kind {
-                    ExprKind::Lit(_) => true,
-                    _ => false,
-                } => {}
+            ExprKind::Unary(UnOp::Neg, ref inner) if matches!(inner.kind, ExprKind::Lit(_)) => {}
             _ => self.err_handler().span_err(
                 expr.span,
                 "arbitrary expressions aren't allowed \