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Skip assert ICE with default_method_body_is_const

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functions marked with #[default_method_body_is_const] would
ICE when being const checked due to it not being a const function:
`tcx.is_const_fn_raw(did)` returns false. We should skip this assert
when it is marked with that attribute.
This commit is contained in:
Deadbeef 2021-08-16 11:29:05 +00:00
parent 58d685ecb3
commit ee85704c04
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1 changed files with 8 additions and 1 deletions
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9
compiler/rustc_mir/src/transform/check_consts/mod.rs
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@ -9,7 +9,7 @@ use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_middle::mir;
use rustc_middle::ty::{self, TyCtxt};
use rustc_span::Symbol;
use rustc_span::{sym, Symbol};
pub use self::qualifs::Qualif;
@ -104,6 +104,13 @@ pub fn rustc_allow_const_fn_unstable(
pub fn is_const_stable_const_fn(tcx: TyCtxt<'tcx>, def_id: DefId) -> bool {
use attr::{ConstStability, Stability, StabilityLevel};
// A default body marked const is not const-stable because const
// trait fns currently cannot be const-stable. We shouldn't
// restrict default bodies to only call const-stable functions.
if tcx.has_attr(def_id, sym::default_method_body_is_const) {
return false;
}
// Const-stability is only relevant for `const fn`.
assert!(tcx.is_const_fn_raw(def_id));