support `default impl` for specialization

    pr review

2 files changed, 125 insertions, 0 deletions

diff --git a/src/test/compile-fail/specialization/defaultimpl/specialization-no-default-trait-implementations.rs b/src/test/compile-fail/specialization/defaultimpl/specialization-no-default-trait-implementations.rs
new file mode 100644
index 00000000000..c1746d765dd
--- /dev/null
+++ b/src/test/compile-fail/specialization/defaultimpl/specialization-no-default-trait-implementations.rs
@@ -0,0 +1,19 @@
+// 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.
+
+#![feature(specialization)]
+#![feature(optin_builtin_traits)]
+
+trait Foo {}
+
+default impl Foo for .. {}
+//~^ ERROR `default impl` is not allowed for default trait implementations
+
+fn main() {}
diff --git a/src/test/run-pass/specialization/defaultimpl/specialization-basics-unsafe.rs b/src/test/run-pass/specialization/defaultimpl/specialization-basics-unsafe.rs
new file mode 100644
index 00000000000..9376d0db2df
--- /dev/null
+++ b/src/test/run-pass/specialization/defaultimpl/specialization-basics-unsafe.rs
@@ -0,0 +1,106 @@
+// Copyright 2014 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.
+
+#![feature(specialization)]
+
+// Tests a variety of basic specialization scenarios and method
+// dispatch for them.
+
+unsafe trait Foo {
+    fn foo(&self) -> &'static str;
+}
+
+unsafe default impl<T> Foo for T {
+    fn foo(&self) -> &'static str {
+        "generic"
+    }
+}
+
+unsafe default impl<T: Clone> Foo for T {
+    fn foo(&self) -> &'static str {
+        "generic Clone"
+    }
+}
+
+unsafe default impl<T, U> Foo for (T, U) where T: Clone, U: Clone {
+    fn foo(&self) -> &'static str {
+        "generic pair"
+    }
+}
+
+unsafe default impl<T: Clone> Foo for (T, T) {
+    fn foo(&self) -> &'static str {
+        "generic uniform pair"
+    }
+}
+
+unsafe default impl Foo for (u8, u32) {
+    fn foo(&self) -> &'static str {
+        "(u8, u32)"
+    }
+}
+
+unsafe default impl Foo for (u8, u8) {
+    fn foo(&self) -> &'static str {
+        "(u8, u8)"
+    }
+}
+
+unsafe default impl<T: Clone> Foo for Vec<T> {
+    fn foo(&self) -> &'static str {
+        "generic Vec"
+    }
+}
+
+unsafe impl Foo for Vec<i32> {
+    fn foo(&self) -> &'static str {
+        "Vec<i32>"
+    }
+}
+
+unsafe impl Foo for String {
+    fn foo(&self) -> &'static str {
+        "String"
+    }
+}
+
+unsafe impl Foo for i32 {
+    fn foo(&self) -> &'static str {
+        "i32"
+    }
+}
+
+struct NotClone;
+
+unsafe trait MyMarker {}
+unsafe default impl<T: Clone + MyMarker> Foo for T {
+    fn foo(&self) -> &'static str {
+        "generic Clone + MyMarker"
+    }
+}
+
+#[derive(Clone)]
+struct MarkedAndClone;
+unsafe impl MyMarker for MarkedAndClone {}
+
+fn  main() {
+    assert!(NotClone.foo() == "generic");
+    assert!(0u8.foo() == "generic Clone");
+    assert!(vec![NotClone].foo() == "generic");
+    assert!(vec![0u8].foo() == "generic Vec");
+    assert!(vec![0i32].foo() == "Vec<i32>");
+    assert!(0i32.foo() == "i32");
+    assert!(String::new().foo() == "String");
+    assert!(((), 0).foo() == "generic pair");
+    assert!(((), ()).foo() == "generic uniform pair");
+    assert!((0u8, 0u32).foo() == "(u8, u32)");
+    assert!((0u8, 0u8).foo() == "(u8, u8)");
+    assert!(MarkedAndClone.foo() == "generic Clone + MyMarker");
+}