Rollup merge of rust-lang#30747 - nagisa:mir-reenable-test, r=nikomatsakis

Fixes rust-lang#30674

The test seems to work fine and assertion passes. The test seems to also be generated from MIR (LLVM IR has footprint of MIR translator), thus I’m reenabling it.

Author: steveklabnik

src/test/run-pass/mir_trans_calls.rs

@@ -58,16 +58,11 @@ fn test5(x: &Bar, a: isize) -> isize {
     x.extension_method(a)
 }
 
-// FIXME #30661: Although this function has the #[rustc_mir] attribute it never
-//               was translated via the MIR implementation because attributes
-//               where not passed along to trans::base::trans_fn() for generic
-//               functions.
-//               Uncomment this test once the thing it tests is fixed.
-// #[rustc_mir]
-// fn test6<T: Bar>(x: &T, a: isize) -> isize {
-//     // Test calling extension method on generic callee
-//     x.extension_method(a)
-// }
+#[rustc_mir]
+fn test6<T: Bar>(x: &T, a: isize) -> isize {
+    // Test calling extension method on generic callee
+    x.extension_method(a)
+}
 
 trait One<T = Self> {
     fn one() -> T;
@@ -119,8 +114,7 @@ fn main() {
     assert_eq!(test3(&Foo, 42), 42);
     assert_eq!(test4(&Foo, 970), 970);
     assert_eq!(test5(&Foo, 8576), 8576);
-    // see definition of test6() above
-    // assert_eq!(test6(&Foo, 12367), 12367);
+    assert_eq!(test6(&Foo, 12367), 12367);
     assert_eq!(test7(), 1);
     assert_eq!(test8(), 2);