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error: invalid format string: expected `'}'` but string was terminated
--> $DIR/issue-91556.rs:2:19
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LL | let _ = format!(concat!("{0}π³πΎππ{"), i);
| ^^^^^^^^^^^^^^^^^^^ expected `'}'` in format string
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= note: if you intended to print `{`, you can escape it using `{{`
= note: this error originates in the macro `concat` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 1 previous error
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