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Add another test using projection types in impls.
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src/test/run-pass/associated-types-projection-from-known-type-in-impl.rs
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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// Test where the impl self type uses a projection from a constant type. | ||
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trait Int | ||
{ | ||
type T; | ||
} | ||
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trait NonZero | ||
{ | ||
fn non_zero(self) -> bool; | ||
} | ||
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impl Int for i32 { type T = i32; } | ||
impl Int for i64 { type T = i64; } | ||
impl Int for u32 { type T = u32; } | ||
impl Int for u64 { type T = u64; } | ||
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impl NonZero for <i32 as Int>::T { fn non_zero(self) -> bool { self != 0 } } | ||
impl NonZero for <i64 as Int>::T { fn non_zero(self) -> bool { self != 0 } } | ||
impl NonZero for <u32 as Int>::T { fn non_zero(self) -> bool { self != 0 } } | ||
impl NonZero for <u64 as Int>::T { fn non_zero(self) -> bool { self != 0 } } | ||
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fn main () | ||
{ | ||
assert!(NonZero::non_zero(22_i32)); | ||
assert!(NonZero::non_zero(22_i64)); | ||
assert!(NonZero::non_zero(22_u32)); | ||
assert!(NonZero::non_zero(22_u64)); | ||
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assert!(!NonZero::non_zero(0_i32)); | ||
assert!(!NonZero::non_zero(0_i64)); | ||
assert!(!NonZero::non_zero(0_u32)); | ||
assert!(!NonZero::non_zero(0_u64)); | ||
} |