Add basic test cases for closure bounds. (rust-lang#3569)

Author: bblum

src/test/compile-fail/closure-bounds-cant-promote-superkind-1.rs

@@ -0,0 +1,19 @@
+// Copyright 2013 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.
+
+fn bar(_blk: &fn:Copy()) {
+}
+
+fn foo(blk: &fn()) {
+    bar(blk); //~ ERROR expected bounds `Copy` but found no bounds
+}
+
+fn main() {
+}

src/test/compile-fail/closure-bounds-cant-promote-superkind-2.rs

@@ -0,0 +1,19 @@
+// Copyright 2013 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.
+
+fn bar(_blk: &fn:Const+Owned()) {
+}
+
+fn foo(blk: &fn:Copy+Owned()) {
+    bar(blk); //~ ERROR expected bounds `Owned+Const` but found bounds `Copy+Owned`
+}
+
+fn main() {
+}

src/test/compile-fail/closure-bounds-cant-promote-superkind-in-struct.rs

@@ -0,0 +1,20 @@
+// Copyright 2013 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.
+
+struct X {
+    field: @fn:Copy(),
+}
+
+fn foo(blk: @fn()) -> X {
+    return X { field: blk }; //~ ERROR expected bounds `Copy` but found no bounds
+}
+
+fn main() {
+}

src/test/compile-fail/closure-bounds-copy-cant-capture-noncopyable.rs

@@ -0,0 +1,24 @@
+// Copyright 2013 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.
+
+use std::comm;
+
+fn foo(blk: ~fn:Copy()) {
+    blk();
+}
+
+fn main() {
+    let (p,c) = comm::stream();
+    do foo { // shouldn't be legal
+        c.send(()); //~ ERROR cannot capture variable of type `std::comm::Chan<()>`, which does not fulfill `Copy`, in a bounded closure
+        //~^ NOTE this closure's environment must satisfy `Copy`
+    }
+    p.recv();
+}

src/test/compile-fail/closure-bounds-static-cant-capture-borrowed.rs

@@ -0,0 +1,22 @@
+// Copyright 2013 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.
+
+fn bar(blk: &fn:'static()) {
+}
+
+fn foo(x: &()) {
+    do bar {
+        let _ = x; //~ ERROR cannot capture variable of type `&()`, which does not fulfill `'static`, in a bounded closure
+        //~^ NOTE this closure's environment must satisfy `'static`
+    }
+}
+
+fn main() {
+}

src/test/run-pass/closure-bounds-can-capture-chan.rs

@@ -0,0 +1,23 @@
+// Copyright 2013 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.
+
+use std::comm;
+
+fn foo(blk: ~fn:Owned()) {
+    blk();
+}
+
+fn main() {
+    let (p,c) = comm::stream();
+    do foo {
+        c.send(());
+    }
+    p.recv();
+}

src/test/run-pass/closure-bounds-promote-subkind-1.rs

@@ -0,0 +1,19 @@
+// Copyright 2013 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.
+
+fn bar(_blk: &fn()) {
+}
+
+fn foo(blk: &fn:Copy()) {
+    bar(blk);
+}
+
+fn main() {
+}

src/test/run-pass/closure-bounds-promote-subkind-2.rs

@@ -0,0 +1,19 @@
+// Copyright 2013 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.
+
+fn bar(_blk: &fn:Const+Owned()) {
+}
+
+fn foo(blk: &fn:Const+Copy+Owned()) {
+    bar(blk);
+}
+
+fn main() {
+}

src/test/run-pass/closure-bounds-promote-subkind-in-struct.rs

@@ -0,0 +1,20 @@
+// Copyright 2013 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.
+
+struct X {
+    field: @fn(),
+}
+
+fn foo(blk: @fn:Copy()) -> X {
+    return X { field: blk };
+}
+
+fn main() {
+}