43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
// Test closure that:
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//
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// - takes an argument `y` with lifetime `'a` (in the code, it's anonymous)
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// - stores `y` into another, longer-lived spot with lifetime `'b`
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//
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// Because `'a` and `'b` are two different, unrelated higher-ranked
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// regions with no relationship to one another, this is an error. This
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// error is reported by the closure itself and is not propagated to
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// its creator: this is because `'a` and `'b` are higher-ranked
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// (late-bound) regions and the closure is not allowed to propagate
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// additional where clauses between higher-ranked regions, only those
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// that appear free in its type (hence, we see it before the closure's
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// "external requirements" report).
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//@ compile-flags:-Zverbose-internals
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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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//~^ ERROR
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closure(&mut p, &y);
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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: FnMut(&mut &i32, &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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