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must-use-in-macro-55516.rs
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//@ check-pass
//@ compile-flags: -Wunused
// make sure write!() can't hide its unused Result
fn
main
()
{
use
std
::
fmt
::
Write
;
let
mut
example
=
String
::
new
();
write
!(&
mut
example
,
"{}"
,
42
);
//~WARN must be used
}