mirror of https://github.com/rust-lang/rust
37 lines
856 B
Rust
37 lines
856 B
Rust
// Test that `impl MyTrait<'_> for &i32` is equivalent to `impl<'a,
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// 'b> MyTrait<'a> for &'b i32`.
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#![allow(warnings)]
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use std::fmt::Debug;
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// Equivalent to `Box<dyn Debug + 'static>`:
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trait StaticTrait { }
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impl StaticTrait for Box<dyn Debug> { }
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// Equivalent to `Box<dyn Debug + 'static>`:
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trait NotStaticTrait { }
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impl NotStaticTrait for Box<dyn Debug + '_> { }
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// Check that we don't err when the trait has a lifetime parameter.
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trait TraitWithLifetime<'a> { }
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impl NotStaticTrait for &dyn TraitWithLifetime<'_> { }
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fn static_val<T: StaticTrait>(_: T) {
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}
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fn with_dyn_debug_static<'a>(x: Box<dyn Debug + 'a>) {
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static_val(x);
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//~^ ERROR borrowed data escapes outside of function
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}
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fn not_static_val<T: NotStaticTrait>(_: T) {
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}
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fn with_dyn_debug_not_static<'a>(x: Box<dyn Debug + 'a>) {
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not_static_val(x); // OK
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}
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fn main() {
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}
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