bjoernager/rust
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resolve variables before erasing lifetimes

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b-naber 2021-11-05 18:11:08 +01:00
parent 6000b4844a
commit dae2407368
1 changed files with 5 additions and 4 deletions
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9
compiler/rustc_infer/src/infer/mod.rs
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@ -1585,9 +1585,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
unevaluated: ty::Unevaluated<'tcx>,
span: Option<Span>,
) -> EvalToConstValueResult<'tcx> {
let param_env = self.tcx.erase_regions(param_env);
let mut substs = unevaluated.substs(self.tcx);
substs = self.tcx.erase_regions(substs);
substs = self.resolve_vars_if_possible(substs);
// Postpone the evaluation of constants whose substs depend on inference
@ -1596,15 +1594,18 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
return Err(ErrorHandled::TooGeneric);
}
let param_env_erased = self.tcx.erase_regions(param_env);
let substs_erased = self.tcx.erase_regions(substs);
let unevaluated = ty::Unevaluated {
def: unevaluated.def,
substs_: Some(substs),
substs_: Some(substs_erased),
promoted: unevaluated.promoted,
};
// The return value is the evaluated value which doesn't contain any reference to inference
// variables, thus we don't need to substitute back the original values.
self.tcx.const_eval_resolve(param_env, unevaluated, span)
self.tcx.const_eval_resolve(param_env_erased, unevaluated, span)
}
/// If `typ` is a type variable of some kind, resolve it one level