error: invalid format string: expected `'}'` but string was terminated
  --> $DIR/issue-51848.rs:6:20
   |
LL |         println!("{"); //~ ERROR invalid
   |                    ^ expected `'}'` in format string
...
LL |     macro_with_error!();
   |     -------------------- in this macro invocation
   |
   = note: if you intended to print `{`, you can escape it using `{{`

error: invalid format string: unmatched `}` found
  --> $DIR/issue-51848.rs:18:15
   |
LL |     println!("}"); //~ ERROR invalid
   |               ^ unmatched `}` in format string
   |
   = note: if you intended to print `}`, you can escape it using `}}`

error: aborting due to 2 previous errors