error[E0425]: cannot find value `fake` in this scope
  --> $DIR/macro-backtrace-nested.rs:5:12
   |
LL |     () => (fake)
   |            ^^^^ not found in this scope
...
LL |     1 + call_nested_expr!();
   |         ------------------- in this macro invocation
   |
   = note: this error originates in the macro `nested_expr` which comes from the expansion of the macro `call_nested_expr` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0425]: cannot find value `fake` in this scope
  --> $DIR/macro-backtrace-nested.rs:5:12
   |
LL |     () => (fake)
   |            ^^^^ not found in this scope
...
LL |     call_nested_expr_sum!();
   |     ----------------------- in this macro invocation
   |
   = note: this error originates in the macro `nested_expr` which comes from the expansion of the macro `call_nested_expr_sum` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0425`.