Auto merge of #102995 - JohnTitor:rollup-yomkwge, r=JohnTitor

Rollup of 7 pull requests

Successful merges:

 - #102641 (Support casting boxes to dyn*)
 - #102836 (rustc_target: Fix json target specs using LLD linker flavors in link args)
 - #102949 (should-skip-this: add missing backslash)
 - #102967 (Add test for issue 102964)
 - #102971 (tidy: error if a lang feature is already present)
 - #102974 (Fix small word dupe typos)
 - #102980 (rustdoc: merge separate `.item-info` CSS)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
index abf3c9a363f..4ed99df1e81 100644
--- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
@@ -14,6 +14,7 @@ use rustc_middle::ty::cast::{CastTy, IntTy};
 use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
 use rustc_middle::ty::{self, adjustment::PointerCast, Instance, Ty, TyCtxt};
 use rustc_span::source_map::{Span, DUMMY_SP};
+use rustc_target::abi::Size;
 
 impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
     #[instrument(level = "trace", skip(self, bx))]
@@ -285,6 +286,14 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                                 bug!("Only valid to do a DynStar cast into a DynStar type")
                             };
                         let vtable = get_vtable(bx.cx(), source.ty(self.mir, bx.tcx()), trait_ref);
+                        let vtable = bx.pointercast(vtable, bx.cx().type_ptr_to(bx.cx().type_isize()));
+                        // FIXME(dyn-star): this is probably not the best way to check if this is
+                        // a pointer, and really we should ensure that the value is a suitable
+                        // pointer earlier in the compilation process.
+                        let data = match operand.layout.pointee_info_at(bx.cx(), Size::ZERO) {
+                            Some(_) => bx.ptrtoint(data, bx.cx().type_isize()),
+                            None => data,
+                        };
                         OperandValue::Pair(data, vtable)
                     }
                     mir::CastKind::Pointer(