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reduce sanity check in debug mode

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This commit is contained in:
Ralf Jung 2020-06-24 09:03:01 +02:00
parent a593728fc7
commit 35911eeb93
1 changed files with 8 additions and 2 deletions
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10
src/librustc_mir/interpret/eval_context.rs
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@ -230,8 +230,14 @@ pub(super) fn mir_assign_valid_types<'tcx>(
// late-bound lifetimes are still around and can lead to type
// differences. So we compare ignoring lifetimes.
if equal_up_to_regions(tcx, param_env, src.ty, dest.ty) {
// Make sure the layout is equal, too -- just to be safe. Miri really needs layout equality.
assert_eq!(src.layout, dest.layout);
// Make sure the layout is equal, too -- just to be safe. Miri really
// needs layout equality. For performance reason we skip this check when
// the types are equal. Equal types *can* have different layouts when
// enum downcast is involved (as enum variants carry the type of the
// enum), but those should never occur in assignments.
if cfg!(debug_assertions) || src.ty != dest.ty {
assert_eq!(src.layout, dest.layout);
}
true
} else {
false