mangling_v0: Add a test for mangling of foreign types

Author: petrochenkov

src/test/ui/symbol-names/foreign-types.rs

@@ -0,0 +1,19 @@
+// build-fail
+// compile-flags: -Z symbol-mangling-version=v0
+
+#![feature(extern_types)]
+#![feature(rustc_attrs)]
+
+extern "C" {
+    type ForeignType;
+}
+
+struct Check<T: ?Sized>(T);
+
+#[rustc_symbol_name]
+//~^ ERROR symbol-name(_RMCs
+//~| ERROR demangling(<foreign_types[
+//~| ERROR demangling-alt(<foreign_types::Check<foreign_types::ForeignType>>)
+impl Check<ForeignType> {}
+
+fn main() {}

src/test/ui/symbol-names/foreign-types.stderr

@@ -0,0 +1,20 @@
+error: symbol-name(_RMCsCRATE_HASH_13foreign_typesINtB<REF>_5CheckNvNtB<REF>_011ForeignTypeE)
+  --> $DIR/foreign-types.rs:13:1
+   |
+LL | #[rustc_symbol_name]
+   | ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<foreign_types[HASH]::Check<foreign_types[HASH]::ForeignType>>)
+  --> $DIR/foreign-types.rs:13:1
+   |
+LL | #[rustc_symbol_name]
+   | ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<foreign_types::Check<foreign_types::ForeignType>>)
+  --> $DIR/foreign-types.rs:13:1
+   |
+LL | #[rustc_symbol_name]
+   | ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+