error[E0425]: cannot find value `fake` in this scope
  --> $DIR/macro-backtrace-nested.rs:15:12
   |
15 |     () => (fake) //~ ERROR cannot find
   |            ^^^^ not found in this scope
...
28 |     1 + call_nested_expr!();
   |         ------------------- in this macro invocation

error[E0425]: cannot find value `fake` in this scope
  --> $DIR/macro-backtrace-nested.rs:15:12
   |
15 |     () => (fake) //~ ERROR cannot find
   |            ^^^^ not found in this scope
...
29 |     call_nested_expr_sum!();
   |     ------------------------ in this macro invocation

error: aborting due to 2 previous errors

If you want more information on this error, try using "rustc --explain E0425"