52 lines
837 B
Rust
52 lines
837 B
Rust
//@ run-pass
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// Test that we can quantify lifetimes outside a constraint (i.e., including
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// the self type) in a where clause.
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static mut COUNT: u32 = 1;
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trait Bar<'a> {
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fn bar(&self);
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}
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trait Baz<'a>
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{
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fn baz(&self);
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}
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impl<'a, 'b> Bar<'b> for &'a u32 {
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fn bar(&self) {
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unsafe { COUNT *= 2; }
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}
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}
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impl<'a, 'b> Baz<'b> for &'a u32 {
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fn baz(&self) {
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unsafe { COUNT *= 3; }
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}
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}
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// Test we can use the syntax for HRL including the self type.
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fn foo1<T>(x: &T)
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where for<'a, 'b> &'a T: Bar<'b>
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{
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x.bar()
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}
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// Test we can quantify multiple bounds (i.e., the precedence is sensible).
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fn foo2<T>(x: &T)
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where for<'a, 'b> &'a T: Bar<'b> + Baz<'b>
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{
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x.baz();
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x.bar()
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}
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fn main() {
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let x = 42;
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foo1(&x);
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foo2(&x);
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unsafe {
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assert_eq!(COUNT, 12);
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}
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}
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