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Normalize the types of fields we project out of a struct or tuple str…
…uct. Fixes #20954.
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,41 @@ | ||
// 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 that we correctly normalize the type of a struct field | ||
// which has an associated type. | ||
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pub trait UnifyKey { | ||
type Value; | ||
} | ||
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pub struct Node<K:UnifyKey> { | ||
pub key: K, | ||
pub value: K::Value, | ||
} | ||
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fn foo<K : UnifyKey<Value=Option<V>>,V : Clone>(node: &Node<K>) -> Option<V> { | ||
node.value.clone() | ||
} | ||
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impl UnifyKey for i32 { | ||
type Value = Option<u32>; | ||
} | ||
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impl UnifyKey for u32 { | ||
type Value = Option<i32>; | ||
} | ||
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pub fn main() { | ||
let node: Node<i32> = Node { key: 1, value: Some(22) }; | ||
assert_eq!(foo(&node), Some(22_u32)); | ||
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let node: Node<u32> = Node { key: 1, value: Some(22) }; | ||
assert_eq!(foo(&node), Some(22_i32)); | ||
} |
38 changes: 38 additions & 0 deletions
38
src/test/run-pass/associated-types-struct-field-numbered.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. | ||
|
||
// Test that we correctly normalize the type of a struct field | ||
// which has an associated type. | ||
|
||
pub trait UnifyKey { | ||
type Value; | ||
} | ||
|
||
pub struct Node<K:UnifyKey>(K, K::Value); | ||
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fn foo<K : UnifyKey<Value=Option<V>>,V : Clone>(node: &Node<K>) -> Option<V> { | ||
node.1.clone() | ||
} | ||
|
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impl UnifyKey for i32 { | ||
type Value = Option<u32>; | ||
} | ||
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impl UnifyKey for u32 { | ||
type Value = Option<i32>; | ||
} | ||
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pub fn main() { | ||
let node: Node<i32> = Node(1, Some(22)); | ||
assert_eq!(foo(&node), Some(22_u32)); | ||
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let node: Node<u32> = Node(1, Some(22)); | ||
assert_eq!(foo(&node), Some(22_i32)); | ||
} |