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Diffstat (limited to 'tests/ui/nll/closure-requirements/escape-upvar-ref.rs')
-rw-r--r-- | tests/ui/nll/closure-requirements/escape-upvar-ref.rs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/tests/ui/nll/closure-requirements/escape-upvar-ref.rs b/tests/ui/nll/closure-requirements/escape-upvar-ref.rs new file mode 100644 index 000000000..0a562a0a1 --- /dev/null +++ b/tests/ui/nll/closure-requirements/escape-upvar-ref.rs @@ -0,0 +1,33 @@ +// Test closure that: +// +// - captures a variable `y` by reference +// - stores that reference to `y` into another, longer-lived place (`p`) +// +// Both of these are upvars of reference type (the capture of `y` is +// of type `&'a i32`, the capture of `p` is of type `&mut &'b +// i32`). The closure thus computes a relationship between `'a` and +// `'b`. This relationship is propagated to the closure creator, +// which reports an error. + +// compile-flags:-Zverbose + +#![feature(rustc_attrs)] + +#[rustc_regions] +fn test() { + let x = 44; + let mut p = &x; + + { + let y = 22; + let mut closure = || p = &y; + //~^ ERROR `y` does not live long enough [E0597] + closure(); + } + + deref(p); +} + +fn deref(_p: &i32) { } + +fn main() { } |