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make NOP dyn casts not require anything about the vtable

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Ralf Jung 2022-08-06 17:18:59 -04:00
parent 451817e48f
commit 8520535694
1 changed files with 1 additions and 0 deletions
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src/unsize.rs
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@ -29,6 +29,7 @@ pub(crate) fn unsized_info<'tcx>(
let old_info = let old_info =
old_info.expect("unsized_info: missing old info for trait upcasting coercion"); old_info.expect("unsized_info: missing old info for trait upcasting coercion");
if data_a.principal_def_id() == data_b.principal_def_id() { if data_a.principal_def_id() == data_b.principal_def_id() {
// A NOP cast that doesn't actually change anything, should be allowed even with invalid vtables.
return old_info; return old_info;
} }