diff options
| author | Michael Goulet <michael@errs.io> | 2023-08-09 00:31:26 +0000 |
|---|---|---|
| committer | Maybe Lapkin <waffle.lapkin@gmail.com> | 2024-10-17 20:43:31 +0200 |
| commit | 2f1b15f145a04e08bebbde522c9ece8f0cad3706 (patch) | |
| tree | 736b2ea990a0306661b9bd8a1b350f901e209c2c | |
| parent | 270fb2130c979fe1d1e520dbb8474aa13257d16b (diff) | |
| download | rust-2f1b15f145a04e08bebbde522c9ece8f0cad3706.tar.gz rust-2f1b15f145a04e08bebbde522c9ece8f0cad3706.zip | |
Allow dropping dyn principal
| -rw-r--r-- | src/unsize.rs | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/unsize.rs b/src/unsize.rs index 5c297ebfadb..336934354e1 100644 --- a/src/unsize.rs +++ b/src/unsize.rs @@ -34,7 +34,9 @@ pub(crate) fn unsized_info<'tcx>( { let old_info = old_info.expect("unsized_info: missing old info for trait upcasting coercion"); - if data_a.principal_def_id() == data_b.principal_def_id() { + let b_principal_def_id = data_b.principal_def_id(); + if data_a.principal_def_id() == b_principal_def_id || b_principal_def_id.is_none() { + // A NOP cast that doesn't actually change anything, should be allowed even with invalid vtables. debug_assert!( validate_trivial_unsize(fx.tcx, data_a, data_b), "NOP unsize vtable changed principal trait ref: {data_a} -> {data_b}" |