Nicer ICE for rust-lang#67981

matthiaskrgr · Apr 26, 2023 · 5b6e747 · 5b6e747
1 parent 1c42cb4
commit 5b6e747
Showing 1 changed file with 11 additions and 1 deletion.
diff --git a/compiler/rustc_codegen_ssa/src/mir/mod.rs b/compiler/rustc_codegen_ssa/src/mir/mod.rs
@@ -304,7 +304,17 @@ fn arg_local_refs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
                     bug!("spread argument isn't a tuple?!");
                 };
 
-                let place = PlaceRef::alloca(bx, bx.layout_of(arg_ty));
+                let layout = bx.layout_of(arg_ty);
+
+                // FIXME: support unsized params in "rust-call" ABI
+                if layout.is_unsized() {
+                    span_bug!(
+                        arg_decl.source_info.span,
+                        "\"rust-call\" ABI does not support unsized params",
+                    );
+                }
+
+                let place = PlaceRef::alloca(bx, layout);
                 for i in 0..tupled_arg_tys.len() {
                     let arg = &fx.fn_abi.args[idx];
                     idx += 1;