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issues
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issue-17897.rs
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// run-pass
fn
action
(
mut
cb
:
Box
<
dyn
FnMut
(
usize
)
->
usize
>)
->
usize
{
cb
(
1
)
}
pub
fn
main
()
{
println
!(
"num: {}"
,
action
(
Box
::
new
(
move
|
u
|
u
)));
}