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Add a helper function for checking whether a default function in a trait can be treated as const

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This commit is contained in:
Oli Scherer 2022-05-11 16:02:20 +00:00
parent 257f06587c
commit 4d390de4a3
7 changed files with 20 additions and 18 deletions
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6
compiler/rustc_ty_utils/src/ty.rs
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@ -5,7 +5,7 @@ use rustc_middle::ty::subst::Subst;
use rustc_middle::ty::{
self, Binder, EarlyBinder, Predicate, PredicateKind, ToPredicate, Ty, TyCtxt,
};
use rustc_span::{sym, Span};
use rustc_span::Span;
use rustc_trait_selection::traits;
fn sized_constraint_for_ty<'tcx>(
@ -152,7 +152,9 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
let constness = match hir_id {
Some(hir_id) => match tcx.hir().get(hir_id) {
hir::Node::TraitItem(hir::TraitItem { kind: hir::TraitItemKind::Fn(..), .. }) if matches!(tcx.trait_of_item(def_id), Some(trait_id) if tcx.has_attr(trait_id, sym::const_trait)) => {
hir::Node::TraitItem(hir::TraitItem { kind: hir::TraitItemKind::Fn(..), .. })
if tcx.is_const_default_method(def_id) =>
{
hir::Constness::Const
}