Repository navigation
&str lifetime when variable is borrowed as argument (not captured) by closure #155998
Closed as duplicate
Description
fn myfn(str: &str) {
let c = |s: &mut Option<&str>| *s = Some(str);
}
Compiler says
let c = |s: &mut Option<&str>| *s = Some(str);
| ^^^^^^^^^^^^^^ assignment requires that `'1` must outlive `'static`
If I change the code to
fn myfn(str: &str) {
let mut var = None;
let c = || var = Some(str);
}
It compiles.
Activity
theemathas commentedon Apr 30, 2026
As a workaround, you can manually annotate the lifetime:
QuineDot commentedon Aug 22, 2026
This is #100002 and perhaps others: a hidden or wildcard lifetime in a closure argument types is always interpreted as "must take any lifetime", instead of "takes one specific lifetime".
Removing the
&str(where the hidden lifetime "is") also works around the problem.Overriding default closure inference with a trait-bound identity function "funnel" also works around the problem.