1 files changed, 61 insertions, 0 deletions
diff --git a/tests/codegen-units/item-collection/trait-method-default-impl.rs b/tests/codegen-units/item-collection/trait-method-default-impl.rs
new file mode 100644
index 00000000000..bfcdb6fa142
--- /dev/null
+++ b/tests/codegen-units/item-collection/trait-method-default-impl.rs
@@ -0,0 +1,61 @@
+// compile-flags:-Zprint-mono-items=eager -Zpolymorphize=on
+
+#![deny(dead_code)]
+#![feature(start)]
+
+trait SomeTrait {
+    fn foo(&self) { }
+    fn bar<T>(&self, x: T) -> T { x }
+}
+
+impl SomeTrait for i8 {
+    // take the default implementations
+
+    // For the non-generic foo(), we should generate a codegen-item even if it
+    // is not called anywhere
+    //~ MONO_ITEM fn <i8 as SomeTrait>::foo
+}
+
+trait SomeGenericTrait<T1> {
+    fn foo(&self) { }
+    fn bar<T2>(&self, x: T1, y: T2) {}
+}
+
+// Non-generic impl of generic trait
+impl SomeGenericTrait<u64> for i32 {
+    // take the default implementations
+
+    // For the non-generic foo(), we should generate a codegen-item even if it
+    // is not called anywhere
+    //~ MONO_ITEM fn <i32 as SomeGenericTrait<T1>>::foo
+}
+
+// Non-generic impl of generic trait
+impl<T1> SomeGenericTrait<T1> for u32 {
+    // take the default implementations
+    // since nothing is monomorphic here, nothing should be generated unless used somewhere.
+}
+
+//~ MONO_ITEM fn start
+#[start]
+fn start(_: isize, _: *const *const u8) -> isize {
+    //~ MONO_ITEM fn <i8 as SomeTrait>::bar::<char>
+    let _ = 1i8.bar('c');
+
+    //~ MONO_ITEM fn <i8 as SomeTrait>::bar::<&str>
+    let _ = 2i8.bar("&str");
+
+    //~ MONO_ITEM fn <i32 as SomeGenericTrait<u64>>::bar::<char>
+    0i32.bar(0u64, 'c');
+
+    //~ MONO_ITEM fn <i32 as SomeGenericTrait<u64>>::bar::<&str>
+    0i32.bar(0u64, "&str");
+
+    //~ MONO_ITEM fn <u32 as SomeGenericTrait<i8>>::bar::<&[char; 1]>
+    0u32.bar(0i8, &['c']);
+
+    //~ MONO_ITEM fn <u32 as SomeGenericTrait<i16>>::bar::<()>
+    0u32.bar(0i16, ());
+
+    0
+}