37 lines
955 B
Rust
37 lines
955 B
Rust
//@ check-pass
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// Test that we propagate region relations from closures precisely when there is
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// more than one non-local lower bound.
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// In this case the closure has signature
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// |x: &'4 mut (&'5 (&'1 str, &'2 str), &'3 str)| -> ..
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// We end up with a `'3: '5` constraint that we can propagate as
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// `'3: '1`, `'3: '2`, but previously we approximated it as `'3: 'static`.
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// As an optimization, we primarily propagate bounds for the "representative"
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// of each SCC. As such we have these two similar cases where hopefully one
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// of them will test the case we want (case2, when this test was added).
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mod case1 {
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fn f(s: &str) {
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g(s, |x| h(x));
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}
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fn g<T, F>(_: T, _: F)
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where F: Fn(&mut (&(T, T), T)) {}
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fn h<T>(_: &mut (&(T, T), T)) {}
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}
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mod case2 {
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fn f(s: &str) {
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g(s, |x| h(x));
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}
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fn g<T, F>(_: T, _: F)
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where F: Fn(&mut (T, &(T, T))) {}
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fn h<T>(_: &mut (T, &(T, T))) {}
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}
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fn main() {}
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