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Default to implicit (not explicit) rules for promotability in const fn

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This commit is contained in:
Dylan MacKenzie 2020-09-01 12:28:55 -07:00
parent 9b4154193e
commit e03f4164d9
1 changed files with 8 additions and 1 deletions
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9
compiler/rustc_mir/src/transform/promote_consts.rs
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@ -734,7 +734,14 @@ fn validate_call(
) -> Result<(), Unpromotable> {
let fn_ty = callee.ty(self.body, self.tcx);
if !self.explicit && self.const_kind.is_none() {
// `const` and `static` use the explicit rules for promotion regardless of the `Candidate`,
// meaning calls to `const fn` can be promoted.
let context_uses_explicit_promotion_rules = matches!(
self.const_kind,
Some(hir::ConstContext::Static(_) | hir::ConstContext::Const)
);
if !self.explicit && !context_uses_explicit_promotion_rules {
if let ty::FnDef(def_id, _) = *fn_ty.kind() {
// Never promote runtime `const fn` calls of
// functions without `#[rustc_promotable]`.