new tests for RFC rust-lang#1445

Author: nikomatsakis

src/test/compile-fail/issue-6804.rs

@@ -26,15 +26,11 @@ fn main() { //~ ERROR compilation successful
     //~^^^ WARNING unmatchable NaN in pattern, use the is_nan method in a guard instead
     //~| WARNING floating point constants cannot be used
     //~| WARNING this was previously accepted
-    //~| WARNING floating point constants cannot be used
-    //~| WARNING this was previously accepted
     match [x, 1.0] {
         [NAN, _] => {},
         _ => {},
     };
     //~^^^ WARNING unmatchable NaN in pattern, use the is_nan method in a guard instead
     //~| WARNING floating point constants cannot be used
     //~| WARNING this was previously accepted
-    //~| WARNING floating point constants cannot be used
-    //~| WARNING this was previously accepted
 }

src/test/compile-fail/rfc1445/feature-gate.rs

@@ -0,0 +1,36 @@
+// Copyright 2012 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 structural match is only permitted with a feature gate,
+// and that if a feature gate is supplied, it permits the type to be
+// used in a match.
+
+// revisions: with_gate no_gate
+
+#![allow(dead_code)]
+#![deny(future_incompatible)]
+#![feature(rustc_attrs)]
+#![cfg_attr(with_gate, feature(structural_match))]
+
+#[structural_match] //[no_gate]~ ERROR semantics of constant patterns is not yet settled
+struct Foo {
+    x: u32
+}
+
+const FOO: Foo = Foo { x: 0 };
+
+#[rustc_error]
+fn main() { //[with_gate]~ ERROR compilation successful
+    let y = Foo { x: 1 };
+    match y {
+        FOO => { }
+        _ => { }
+    }
+}

src/test/compile-fail/rfc1445/match-forbidden-without-eq.rs

@@ -0,0 +1,39 @@
+// Copyright 2012 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.
+
+#![allow(dead_code)]
+#![deny(future_incompatible)]
+
+use std::f32;
+
+#[derive(PartialEq)]
+struct Foo {
+    x: u32
+}
+
+const FOO: Foo = Foo { x: 0 };
+
+fn main() {
+    let y = Foo { x: 1 };
+    match y {
+        FOO => { }
+        //~^ ERROR must be annotated with `#[derive(Eq)]`
+        //~| WARNING will become a hard error
+        _ => { }
+    }
+
+    let x = 0.0;
+    match x {
+        f32::INFINITY => { }
+        //~^ ERROR floating point constants cannot be used in patterns
+        //~| WARNING will become a hard error
+        _ => { }
+    }
+}

src/test/run-pass/rfc1445/eq-allows-match-on-ty-in-macro.rs

@@ -0,0 +1,32 @@
+// Copyright 2012 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.
+
+#![allow(dead_code)]
+
+macro_rules! foo {
+    (#[$attr:meta] $x:ident) => {
+        #[$attr]
+        struct $x {
+            x: u32
+        }
+    }
+}
+
+foo! { #[derive(PartialEq, Eq)] Foo }
+
+const FOO: Foo = Foo { x: 0 };
+
+fn main() {
+    let y = Foo { x: 1 };
+    match y {
+        FOO => { }
+        _ => { }
+    }
+}

src/test/run-pass/rfc1445/eq-allows-match.rs

@@ -0,0 +1,26 @@
+// Copyright 2012 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.
+
+#![allow(dead_code)]
+
+#[derive(PartialEq, Eq)]
+struct Foo {
+    x: u32
+}
+
+const FOO: Foo = Foo { x: 0 };
+
+fn main() {
+    let y = Foo { x: 1 };
+    match y {
+        FOO => { }
+        _ => { }
+    }
+}