From 64d98f8ee037282c35007b64c2649055c56af1db Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:03 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- .../closure-requirements/escape-argument-callee.rs | 42 ++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 tests/ui/nll/closure-requirements/escape-argument-callee.rs (limited to 'tests/ui/nll/closure-requirements/escape-argument-callee.rs') diff --git a/tests/ui/nll/closure-requirements/escape-argument-callee.rs b/tests/ui/nll/closure-requirements/escape-argument-callee.rs new file mode 100644 index 000000000..3aea511b0 --- /dev/null +++ b/tests/ui/nll/closure-requirements/escape-argument-callee.rs @@ -0,0 +1,42 @@ +// Test closure that: +// +// - takes an argument `y` with lifetime `'a` (in the code, it's anonymous) +// - stores `y` into another, longer-lived spot with lifetime `'b` +// +// Because `'a` and `'b` are two different, unrelated higher-ranked +// regions with no relationship to one another, this is an error. This +// error is reported by the closure itself and is not propagated to +// its creator: this is because `'a` and `'b` are higher-ranked +// (late-bound) regions and the closure is not allowed to propagate +// additional where clauses between higher-ranked regions, only those +// that appear free in its type (hence, we see it before the closure's +// "external requirements" report). + +// compile-flags:-Zverbose + +#![feature(rustc_attrs)] + +#[rustc_regions] +fn test() { + let x = 44; + let mut p = &x; + + { + let y = 22; + let mut closure = expect_sig(|p, y| *p = y); + //~^ ERROR + closure(&mut p, &y); + } + + deref(p); +} + +fn expect_sig(f: F) -> F + where F: FnMut(&mut &i32, &i32) +{ + f +} + +fn deref(_p: &i32) { } + +fn main() { } -- cgit v1.2.3