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Explain ParamEnv::reveal_all usage

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This commit is contained in:
Oliver Scherer 2019-12-22 12:54:48 +01:00
parent 6b651b1a88
commit 41d58185dd
1 changed files with 5 additions and 0 deletions
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5
src/librustc_mir/interpret/operand.rs
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@ -578,6 +578,11 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
ty::ConstKind::Param(_) => throw_inval!(TooGeneric),
ty::ConstKind::Unevaluated(def_id, substs) => {
let instance = self.resolve(def_id, substs)?;
// For statics we pick `ParamEnv::reveal_all`, because statics don't have generics
// and thus don't care about the parameter environment. While we could just use
// `self.param_env`, that would mean we invoke the query to evaluate the static
// with different parameter environments, thus causing the static to be evaluated
// multiple times.
let param_env = if self.tcx.is_static(def_id) {
ty::ParamEnv::reveal_all()
} else {