Fix `unused_parens` triggers on macro by example code
Fix #66295
Unfortunately this does also break [an existing test](
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| .. | ||
| nonstandard_style | ||
| array_into_iter.rs | ||
| builtin.rs | ||
| Cargo.toml | ||
| lib.rs | ||
| non_ascii_idents.rs | ||
| nonstandard_style.rs | ||
| redundant_semicolon.rs | ||
| types.rs | ||
| unused.rs | ||