librustc: Make monomorphic newtype structs work cross-crate

src/test/auxiliary/newtype_struct_xc.rs

@@ -0,0 +1,4 @@
+#[crate_type="lib"];
+
+pub struct Au(int);
+

src/test/run-pass/newtype-struct-xc-2.rs

@@ -0,0 +1,14 @@
+// xfail-fast
+// aux-build:newtype_struct_xc.rs
+
+extern mod newtype_struct_xc;
+use newtype_struct_xc::Au;
+
+fn f() -> Au {
+    Au(2)
+}
+
+fn main() {
+    let _ = f();
+}
+

src/test/run-pass/newtype-struct-xc.rs

@@ -0,0 +1,9 @@
+// xfail-fast
+// aux-build:newtype_struct_xc.rs
+
+extern mod newtype_struct_xc;
+
+fn main() {
+    let _ = newtype_struct_xc::Au(2);
+}
+