bjoernager/rust
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Extract function trait_may_define_assoc_type

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Santiago Pastorino 2020-11-21 18:16:24 -03:00
parent b60a214c51
commit c0007a2d7e
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3 changed files with 13 additions and 24 deletions
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12
compiler/rustc_middle/src/ty/context.rs
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@ -51,7 +51,7 @@ use rustc_session::config::{BorrowckMode, CrateType, OutputFilenames};
use rustc_session::lint::{Level, Lint};
use rustc_session::Session;
use rustc_span::source_map::MultiSpan;
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
use rustc_target::abi::{Layout, TargetDataLayout, VariantIdx};
use rustc_target::spec::abi;
@ -2085,6 +2085,16 @@ impl<'tcx> TyCtxt<'tcx> {
self.mk_fn_ptr(sig.map_bound(|sig| ty::FnSig { unsafety: hir::Unsafety::Unsafe, ..sig }))
}
/// Given the def_id of a Trait `trait_def_id` and the name of an associated item `assoc_name`
/// returns true if the `trait_def_id` defines an associated item of name `assoc_name`.
pub fn trait_may_define_assoc_type(self, trait_def_id: DefId, assoc_name: Ident) -> bool {
self.super_traits_of(trait_def_id).iter().any(|trait_did| {
self.associated_items(*trait_did)
.find_by_name_and_kind(self, assoc_name, ty::AssocKind::Type, *trait_did)
.is_some()
})
}
/// Given a closure signature, returns an equivalent fn signature. Detuples
/// and so forth -- so e.g., if we have a sig with `Fn<(u32, i32)>` then
/// you would get a `fn(u32, i32)`.