mirror of https://github.com/rust-lang/rust
43 lines
937 B
Rust
43 lines
937 B
Rust
// Test closure that:
|
|
//
|
|
// - takes an argument `y`
|
|
// - stores `y` into another, longer-lived spot
|
|
//
|
|
// but is invoked with a spot that doesn't live long
|
|
// enough to store `y`.
|
|
//
|
|
// The error is reported in the caller: invoking the closure links the
|
|
// lifetime of the variable that is given as `y` (via subtyping) and
|
|
// thus forces the corresponding borrow to live too long. This is
|
|
// basically checking that the MIR type checker correctly enforces the
|
|
// closure signature.
|
|
|
|
//@ compile-flags:-Zverbose-internals
|
|
|
|
#![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);
|
|
closure(&mut p, &y);
|
|
//~^ ERROR `y` does not live long enough [E0597]
|
|
}
|
|
|
|
deref(p);
|
|
}
|
|
|
|
fn expect_sig<F>(f: F) -> F
|
|
where F: for<'a, 'b> FnMut(&'a mut &'b i32, &'b i32)
|
|
{
|
|
f
|
|
}
|
|
|
|
fn deref(_p: &i32) { }
|
|
|
|
fn main() { }
|