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Rollup merge of #110791 - compiler-errors:negative-bounds, r=oli-obk

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Implement negative bounds for internal testing purposes

Implements partial support the `!` negative polarity on trait bounds. This is incomplete, but should allow us to at least be able to play with the feature.

Not even gonna consider them as a public-facing feature, but I'm implementing them because would've been nice to have in UI tests, for example in #110671.
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Dylan DPC 2023-05-04 00:17:23 +05:30 • committed by GitHub
commit 80df4ab403
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42 changed files with 481 additions and 188 deletions
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compiler/rustc_parse/src/parser/diagnostics.rs
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@ -1284,7 +1284,7 @@ impl<'a> Parser<'a> {
}
self.bump(); // `+`
let bounds = self.parse_generic_bounds(None)?;
let bounds = self.parse_generic_bounds()?;
let sum_span = ty.span.to(self.prev_token.span);
let sub = match &ty.kind {