error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/fn-or-tuple-struct-with-underscore-args.rs:10:24
   |
LL |     let _: usize = foo(_, _);
   |                        ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/fn-or-tuple-struct-with-underscore-args.rs:10:27
   |
LL |     let _: usize = foo(_, _);
   |                           ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/fn-or-tuple-struct-with-underscore-args.rs:13:18
   |
LL |     let _: S = S(_, _);
   |                  ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/fn-or-tuple-struct-with-underscore-args.rs:13:21
   |
LL |     let _: S = S(_, _);
   |                     ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/fn-or-tuple-struct-with-underscore-args.rs:16:27
   |
LL |     let _: usize = T::baz(_, _);
   |                           ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/fn-or-tuple-struct-with-underscore-args.rs:16:30
   |
LL |     let _: usize = T::baz(_, _);
   |                              ^ `_` not allowed here

error: aborting due to 6 previous errors