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Add async bound modifier to enable async Fn bounds

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This commit is contained in:
Michael Goulet 2024-01-26 17:00:28 +00:00
parent cdaa12e3df
commit 0eb2adb7e8
12 changed files with 199 additions and 59 deletions
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16
compiler/rustc_parse/src/parser/ty.rs
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@ -8,14 +8,13 @@ use crate::errors::{
};
use crate::{maybe_recover_from_interpolated_ty_qpath, maybe_whole};
use ast::DUMMY_NODE_ID;
use rustc_ast::ptr::P;
use rustc_ast::token::{self, Delimiter, Token, TokenKind};
use rustc_ast::util::case::Case;
use rustc_ast::{
self as ast, BareFnTy, BoundConstness, BoundPolarity, FnRetTy, GenericBound, GenericBounds,
GenericParam, Generics, Lifetime, MacCall, MutTy, Mutability, PolyTraitRef,
TraitBoundModifiers, TraitObjectSyntax, Ty, TyKind,
self as ast, BareFnTy, BoundAsyncness, BoundConstness, BoundPolarity, FnRetTy, GenericBound,
GenericBounds, GenericParam, Generics, Lifetime, MacCall, MutTy, Mutability, PolyTraitRef,
TraitBoundModifiers, TraitObjectSyntax, Ty, TyKind, DUMMY_NODE_ID,
};
use rustc_errors::{Applicability, PResult};
use rustc_span::symbol::{kw, sym, Ident};
@ -880,6 +879,13 @@ impl<'a> Parser<'a> {
BoundConstness::Never
};
let asyncness = if self.token.span.at_least_rust_2018() && self.eat_keyword(kw::Async) {
self.sess.gated_spans.gate(sym::async_closure, self.prev_token.span);
BoundAsyncness::Async(self.prev_token.span)
} else {
BoundAsyncness::Normal
};
let polarity = if self.eat(&token::Question) {
BoundPolarity::Maybe(self.prev_token.span)
} else if self.eat(&token::Not) {
@ -889,7 +895,7 @@ impl<'a> Parser<'a> {
BoundPolarity::Positive
};
Ok(TraitBoundModifiers { constness, polarity })
Ok(TraitBoundModifiers { constness, asyncness, polarity })
}
/// Parses a type bound according to: