tweak suggestion for argument-position `impl ?Sized`
fixes this invalid suggestion:
```text
help: consider removing the `?Sized` bound to make the type parameter `Sized`
|
1 - fn foo(_: impl ?Sized) {}
1 + fn foo(_: impl ) {}
|
```
|
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| .. | ||
| assembly | ||
| auxiliary | ||
| codegen | ||
| codegen-units | ||
| debuginfo | ||
| incremental | ||
| mir-opt | ||
| pretty | ||
| run-make | ||
| run-make-fulldeps | ||
| run-pass-valgrind | ||
| rustdoc | ||
| rustdoc-gui | ||
| rustdoc-js | ||
| rustdoc-js-std | ||
| rustdoc-json | ||
| rustdoc-ui | ||
| ui | ||
| ui-fulldeps | ||
| COMPILER_TESTS.md | ||