bjoernager/rust
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use ty::Unevaluated<'tcx, ()> in type system

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This commit is contained in:
b-naber 2022-06-27 16:32:47 +02:00
parent 7098c181f8
commit a4bbb8db5c
32 changed files with 304 additions and 192 deletions
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25
compiler/rustc_mir_transform/src/const_prop_lint.rs
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@ -22,9 +22,7 @@ use rustc_middle::mir::{
};
use rustc_middle::ty::layout::{LayoutError, LayoutOf, LayoutOfHelpers, TyAndLayout};
use rustc_middle::ty::subst::{InternalSubsts, Subst};
use rustc_middle::ty::{
self, ConstInt, ConstKind, Instance, ParamEnv, ScalarInt, Ty, TyCtxt, TypeVisitable,
};
use rustc_middle::ty::{self, ConstInt, Instance, ParamEnv, ScalarInt, Ty, TyCtxt, TypeVisitable};
use rustc_session::lint;
use rustc_span::Span;
use rustc_target::abi::{HasDataLayout, Size, TargetDataLayout};
@ -301,18 +299,17 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
let err = ConstEvalErr::new(&self.ecx, error, Some(c.span));
if let Some(lint_root) = self.lint_root(source_info) {
let lint_only = match c.literal {
ConstantKind::Ty(ct) => match ct.kind() {
ConstantKind::Ty(_) => c.literal.needs_subst(),
ConstantKind::Unevaluated(
ty::Unevaluated { def: _, substs: _, promoted: Some(_) },
_,
) => {
// Promoteds must lint and not error as the user didn't ask for them
ConstKind::Unevaluated(ty::Unevaluated {
def: _,
substs: _,
promoted: Some(_),
}) => true,
// Out of backwards compatibility we cannot report hard errors in unused
// generic functions using associated constants of the generic parameters.
_ => c.literal.needs_subst(),
},
ConstantKind::Val(_, ty) => ty.needs_subst(),
true
}
ConstantKind::Unevaluated(_, ty) | ConstantKind::Val(_, ty) => {
ty.needs_subst()
}
};
if lint_only {
// Out of backwards compatibility we cannot report hard errors in unused