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https://github.com/rust-lang/rust
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42 lines
926 B
Rust
42 lines
926 B
Rust
// Test closure that:
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//
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// - takes an argument `y`
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// - stores `y` into another, longer-lived spot
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//
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// but is invoked with a spot that doesn't live long
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// enough to store `y`.
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//
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// The error is reported in the caller: invoking the closure links the
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// lifetime of the variable that is given as `y` (via subtyping) and
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// thus forces the corresponding borrow to live too long. This is
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// basically checking that the MIR type checker correctly enforces the
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// closure signature.
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// compile-flags:-Zverbose
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#![feature(rustc_attrs)]
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#[rustc_regions]
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fn test() {
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let x = 44;
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let mut p = &x;
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{
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let y = 22;
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let mut closure = expect_sig(|p, y| *p = y);
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closure(&mut p, &y);
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//~^ ERROR `y` does not live long enough [E0597]
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}
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deref(p);
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}
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fn expect_sig<F>(f: F) -> F
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where F: for<'a, 'b> FnMut(&'a mut &'b i32, &'b i32)
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{
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f
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}
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fn deref(_p: &i32) { }
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fn main() { }
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