mirror of https://github.com/rust-lang/rust
99 lines
2.0 KiB
Rust
99 lines
2.0 KiB
Rust
//@ run-pass
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#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
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// Tests a variety of basic specialization scenarios and method
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// dispatch for them.
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trait Foo {
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fn foo(&self) -> &'static str;
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}
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impl<T> Foo for T {
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default fn foo(&self) -> &'static str {
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"generic"
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}
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}
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impl<T: Clone> Foo for T {
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default fn foo(&self) -> &'static str {
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"generic Clone"
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}
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}
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impl<T, U> Foo for (T, U) where T: Clone, U: Clone {
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default fn foo(&self) -> &'static str {
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"generic pair"
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}
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}
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impl<T: Clone> Foo for (T, T) {
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default fn foo(&self) -> &'static str {
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"generic uniform pair"
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}
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}
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impl Foo for (u8, u32) {
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default fn foo(&self) -> &'static str {
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"(u8, u32)"
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}
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}
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impl Foo for (u8, u8) {
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default fn foo(&self) -> &'static str {
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"(u8, u8)"
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}
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}
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impl<T: Clone> Foo for Vec<T> {
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default fn foo(&self) -> &'static str {
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"generic Vec"
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}
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}
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impl Foo for Vec<i32> {
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fn foo(&self) -> &'static str {
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"Vec<i32>"
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}
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}
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impl Foo for String {
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fn foo(&self) -> &'static str {
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"String"
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}
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}
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impl Foo for i32 {
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fn foo(&self) -> &'static str {
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"i32"
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}
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}
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struct NotClone;
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trait MyMarker {}
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impl<T: Clone + MyMarker> Foo for T {
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default fn foo(&self) -> &'static str {
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"generic Clone + MyMarker"
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}
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}
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#[derive(Clone)]
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struct MarkedAndClone;
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impl MyMarker for MarkedAndClone {}
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fn main() {
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assert!(NotClone.foo() == "generic");
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assert!(0u8.foo() == "generic Clone");
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assert!(vec![NotClone].foo() == "generic");
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assert!(vec![0u8].foo() == "generic Vec");
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assert!(vec![0i32].foo() == "Vec<i32>");
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assert!(0i32.foo() == "i32");
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assert!(String::new().foo() == "String");
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assert!(((), 0).foo() == "generic pair");
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assert!(((), ()).foo() == "generic uniform pair");
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assert!((0u8, 0u32).foo() == "(u8, u32)");
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assert!((0u8, 0u8).foo() == "(u8, u8)");
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assert!(MarkedAndClone.foo() == "generic Clone + MyMarker");
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}
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