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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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3
compiler/rustc_const_eval/src/const_eval/machine.rs
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@ -278,8 +278,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
// at all.
if !ecx.tcx.is_const_fn_raw(def.did) {
// allow calling functions inside a trait marked with #[const_trait].
if !matches!(ecx.tcx.trait_of_item(def.did), Some(trait_id) if ecx.tcx.has_attr(trait_id, sym::const_trait))
{
if !ecx.tcx.is_const_default_method(def.did) {
// We certainly do *not* want to actually call the fn
// though, so be sure we return here.
throw_unsup_format!("calling non-const function `{}`", instance)