Rollup merge of #134834 - dtolnay:unnamedcall, r=compiler-errors

Skip parenthesis around tuple struct field calls

The pretty-printer previously did not distinguish between named vs unnamed fields when printing a function call containing a struct field. It would print the call as `(self.fun)()` for a named field which is correct, and `(self.0)()` for an unnamed field which is redundant.

This PR changes function calls of tuple struct fields to print without parens.

**Before:**

```rust
struct Tuple(fn());

fn main() {
    let tuple = Tuple(|| {});
    (tuple.0)();
}
```

**After:**

```rust
struct Tuple(fn());

fn main() {
    let tuple = Tuple(|| {});
    tuple.0();
}
```

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_parse/src/parser/diagnostics.rs b/compiler/rustc_parse/src/parser/diagnostics.rs
index aab4e1b1afc..7df7e732925 100644
--- a/compiler/rustc_parse/src/parser/diagnostics.rs
+++ b/compiler/rustc_parse/src/parser/diagnostics.rs
@@ -1336,7 +1336,7 @@ impl<'a> Parser<'a> {
     ) -> bool {
         if let ExprKind::Binary(op, l1, r1) = &inner_op.kind {
             if let ExprKind::Field(_, ident) = l1.kind
-                && ident.as_str().parse::<i32>().is_err()
+                && !ident.is_numeric()
                 && !matches!(r1.kind, ExprKind::Lit(_))
             {
                 // The parser has encountered `foo.bar<baz`, the likelihood of the turbofish