1 error: invalid format string: unmatched `}` found
2 --> $DIR/issue-86085.rs:4:12
4 LL | format ! ( concat ! ( r#"lJ�.�"# , "r} {}" ) ) ;
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unmatched `}` in format string
7 = note: if you intended to print `}`, you can escape it using `}}`
8 = note: this error originates in the macro `concat` (in Nightly builds, run with -Z macro-backtrace for more info)
10 error: aborting due to previous error