error: This argument is assigned more than once.
  --> $DIR/error-call-repeat-assign.rs:16:14
   |
16 |   foo!(1,c=1,c=1);
   |   -----------^---- in this macro invocation

error: Previously assigned here
  --> $DIR/error-call-repeat-assign.rs:16:10
   |
16 |   foo!(1,c=1,c=1);
   |   -------^-------- in this macro invocation

error: This argument is assigned more than once.
  --> $DIR/error-call-repeat-assign.rs:17:14
   |
17 |   foo!(1,c=1,a=1);
   |   -----------^---- in this macro invocation

error: Previously assigned here
  --> $DIR/error-call-repeat-assign.rs:17:8
   |
17 |   foo!(1,c=1,a=1);
   |   -----^---------- in this macro invocation