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Rollup merge of #137637 - compiler-errors:dyn-cast-from-dyn-star, r=oli-obk

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Check dyn flavor before registering upcast goal on wide pointer cast in MIR typeck

See the comment on the test :)

Fixes #137579
This commit is contained in:
Michael Goulet 2025-03-06 12:22:13 -05:00 • committed by GitHub
commit 3152f16ada
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2 changed files with 21 additions and 2 deletions
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4
compiler/rustc_borrowck/src/type_check/mod.rs
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@ -2120,8 +2120,8 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
//
// Note that other checks (such as denying `dyn Send` -> `dyn
// Debug`) are in `rustc_hir_typeck`.
if let ty::Dynamic(src_tty, _src_lt, _) = *src_tail.kind()
&& let ty::Dynamic(dst_tty, dst_lt, _) = *dst_tail.kind()
if let ty::Dynamic(src_tty, _src_lt, ty::Dyn) = *src_tail.kind()
&& let ty::Dynamic(dst_tty, dst_lt, ty::Dyn) = *dst_tail.kind()
&& src_tty.principal().is_some()
&& dst_tty.principal().is_some()
{