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Explain revealing of opaque types in layout_of ParamEnv #115762

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Merged
bors merged 1 commit into from
Sep 18, 2023
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Explain revealing of opaque types in layout_of ParamEnv #115762

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3 changes: 3 additions & 0 deletions compiler/rustc_ty_utils/src/layout.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,9 @@ fn layout_of<'tcx>(
let (param_env, ty) = query.into_parts();
debug!(?ty);

// Optimization: We convert to RevealAll and convert opaque types in the where bounds
// to their hidden types. This reduces overall uncached invocations of `layout_of` and
// is thus a small performance improvement.
let param_env = param_env.with_reveal_all_normalized(tcx);
let unnormalized_ty = ty;

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