3 ms·

This can never happen with regular string literals. String literals have the type `&'static str` but formatting returns a `String`.

• pornel 5y ago
  Perhaps something could be done with compile-time code execution, but the bigger problem is that it wouldn't be backwards-compatible. Currently "{foo}" is a perfectly valid string that doesn't evaluate anything.
  • hajile 5y ago
    In truth, it probably requires something like `f"foo {bar}"`