bjoernager/rust
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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.
This commit is contained in:
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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10
compiler/rustc_parse/src/parser/item.rs
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@ -788,11 +788,7 @@ impl<'a> Parser<'a> {
// Parse optional colon and supertrait bounds.
let had_colon = self.eat(&token::Colon);
let span_at_colon = self.prev_token.span;
let bounds = if had_colon {
self.parse_generic_bounds(Some(self.prev_token.span))?
} else {
Vec::new()
};
let bounds = if had_colon { self.parse_generic_bounds()? } else { Vec::new() };
let span_before_eq = self.prev_token.span;
if self.eat(&token::Eq) {
@ -802,7 +798,7 @@ impl<'a> Parser<'a> {
self.sess.emit_err(errors::BoundsNotAllowedOnTraitAliases { span });
}
let bounds = self.parse_generic_bounds(None)?;
let bounds = self.parse_generic_bounds()?;
generics.where_clause = self.parse_where_clause()?;
self.expect_semi()?;
@ -883,7 +879,7 @@ impl<'a> Parser<'a> {
// Parse optional colon and param bounds.
let bounds =
if self.eat(&token::Colon) { self.parse_generic_bounds(None)? } else { Vec::new() };
if self.eat(&token::Colon) { self.parse_generic_bounds()? } else { Vec::new() };
let before_where_clause = self.parse_where_clause()?;
let ty = if self.eat(&token::Eq) { Some(self.parse_ty()?) } else { None };