79 lines
1.4 KiB
Rust
79 lines
1.4 KiB
Rust
#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
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// Check a number of scenarios in which one impl tries to override another,
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// without correctly using `default`.
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// Test 1: one layer of specialization, multiple methods, missing `default`
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trait Foo {
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fn foo(&self);
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fn bar(&self);
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}
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impl<T> Foo for T {
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fn foo(&self) {}
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fn bar(&self) {}
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}
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impl Foo for u8 {}
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impl Foo for u16 {
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fn foo(&self) {} //~ ERROR E0520
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}
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impl Foo for u32 {
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fn bar(&self) {} //~ ERROR E0520
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}
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// Test 2: one layer of specialization, missing `default` on associated type
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trait Bar {
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type T;
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}
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impl<T> Bar for T {
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type T = u8;
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}
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impl Bar for u8 {
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type T = (); //~ ERROR E0520
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}
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// Test 3a: multiple layers of specialization, missing interior `default`
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trait Baz {
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fn baz(&self);
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}
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default impl<T> Baz for T {
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fn baz(&self) {}
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}
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impl<T: Clone> Baz for T {
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fn baz(&self) {}
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}
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impl Baz for i32 {
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fn baz(&self) {} //~ ERROR E0520
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}
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// Test 3b: multiple layers of specialization, missing interior `default`,
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// redundant `default` in bottom layer.
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trait Redundant {
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fn redundant(&self);
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}
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default impl<T> Redundant for T {
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fn redundant(&self) {}
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}
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impl<T: Clone> Redundant for T {
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fn redundant(&self) {}
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}
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default impl Redundant for i32 {
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fn redundant(&self) {}
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//~^ ERROR `redundant` specializes an item from a parent `impl`, but that item is not marked `default`
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}
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fn main() {}
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