File: must-use-in-macro-55516.stderr

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warning: unused `Result` that must be used
  --> $DIR/must-use-in-macro-55516.rs:9:5
   |
LL |     write!(&mut example, "{}", 42);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
   = note: `-W unused-must-use` implied by `-W unused`
   = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 1 warning emitted