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Auto merge of #122500 - petrochenkov:deleg, r=fmease

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delegation: Support renaming, and async, const, extern "ABI" and C-variadic functions

Also allow delegating to functions with opaque types (`impl Trait`).
The delegation item will refer to the original opaque type from the callee, fresh opaque type won't be created, which seems like a reasonable behavior.
(Such delegation items will cause query cycles when used in trait impls, but it can be fixed later.)

Part of https://github.com/rust-lang/rust/issues/118212.
This commit is contained in:
bors 2024-04-24 11:57:35 +00:00
commit 5557f8c9d0
17 changed files with 282 additions and 160 deletions
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28
compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
View file

@ -1964,11 +1964,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
try_emit("recursive delegation");
}
let sig = self.tcx().fn_sig(sig_id).instantiate_identity();
if sig.output().has_opaque_types() {
try_emit("delegation to a function with opaque type");
}
let sig_generics = self.tcx().generics_of(sig_id);
let parent = self.tcx().parent(self.item_def_id());
let parent_generics = self.tcx().generics_of(parent);
@ -1991,29 +1986,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
try_emit("delegation to a trait method from a free function");
}
if self.tcx().asyncness(sig_id) == ty::Asyncness::Yes {
try_emit("delegation to async functions");
}
if self.tcx().constness(sig_id) == hir::Constness::Const {
try_emit("delegation to const functions");
}
if sig.c_variadic() {
try_emit("delegation to variadic functions");
// variadic functions are also `unsafe` and `extern "C"`.
// Do not emit same error multiple times.
return error_occured;
}
if let hir::Unsafety::Unsafe = sig.unsafety() {
try_emit("delegation to unsafe functions");
}
if abi::Abi::Rust != sig.abi() {
try_emit("delegation to non Rust ABI functions");
}
error_occured
}