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Comment why normalization is needed for debug assertions

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This commit is contained in:
Michael Goulet 2022-10-20 17:53:29 +00:00
parent dd51b36fb2
commit 6e6fe30d0f
2 changed files with 14 additions and 2 deletions
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7
compiler/rustc_mir_build/src/thir/pattern/mod.rs
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@ -483,7 +483,12 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
// Use `Reveal::All` here because patterns are always monomorphic even if their function
// isn't.
let param_env_reveal_all = self.param_env.with_reveal_all_normalized(self.tcx);
let substs = self.typeck_results.node_substs(id);
// N.B. There is no guarantee that substs collected in typeck results are fully normalized,
// so they need to be normalized in order to pass to `Instance::resolve`, which will ICE
// if given unnormalized types.
let substs = self
.tcx
.normalize_erasing_regions(param_env_reveal_all, self.typeck_results.node_substs(id));
let instance = match ty::Instance::resolve(self.tcx, param_env_reveal_all, def_id, substs) {
Ok(Some(i)) => i,
Ok(None) => {