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issue-49579.rs
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// check-pass
fn
fibs
(
n
:
u32
)
->
impl
Iterator
<
Item
=
u128
>
{
(
0
..
n
)
.
scan
((
0
,
1
),
|
st
,
_
|
{
*
st
=
(
st
.
1
,
st
.
0
+
st
.
1
);
Some
(*
st
)
})
.
map
(&|(
f
,
_
)|
f
)
}
fn
main
()
{
println
!(
"{:?}"
,
fibs
(
10
).
collect
::<
Vec
<
_
>>());
}