test: add testcases for external iterators using foreach.

Author: graydon

src/test/run-pass/foreach-external-iterators-break.rs

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+// 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.
+
+fn main() {
+    let x = [1,..100];
+    let mut y = 0;
+    foreach i in x.iter() {
+        if y > 10 {
+            break;
+        }
+        y += *i;
+    }
+    assert!(y == 11);
+}

src/test/run-pass/foreach-external-iterators-hashmap-break-restart.rs

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+// 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.
+
+use std::hashmap::HashMap;
+
+// This is a fancy one: it uses an external iterator established
+// outside the loop, breaks, then _picks back up_ and continues
+// iterating with it.
+
+fn main() {
+    let mut h = HashMap::new();
+    let kvs = [(1, 10), (2, 20), (3, 30)];
+    foreach &(k,v) in kvs.iter() {
+        h.insert(k,v);
+    }
+    let mut x = 0;
+    let mut y = 0;
+
+    let mut i = h.iter();
+
+    foreach (&k,&v) in i {
+        x += k;
+        y += v;
+        break;
+    }
+
+    foreach (&k,&v) in i {
+        x += k;
+        y += v;
+    }
+
+    assert_eq!(x, 6);
+    assert_eq!(y, 60);
+}

src/test/run-pass/foreach-external-iterators-hashmap.rs

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+// 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.
+
+use std::hashmap::HashMap;
+
+fn main() {
+    let mut h = HashMap::new();
+    let kvs = [(1, 10), (2, 20), (3, 30)];
+    foreach &(k,v) in kvs.iter() {
+        h.insert(k,v);
+    }
+    let mut x = 0;
+    let mut y = 0;
+    foreach (&k,&v) in h.iter() {
+        x += k;
+        y += v;
+    }
+    assert_eq!(x, 6);
+    assert_eq!(y, 60);
+}

src/test/run-pass/foreach-external-iterators-loop.rs

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+// 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.
+
+fn main() {
+    let x = [1,..100];
+    let mut y = 0;
+    foreach (n,i) in x.iter().enumerate() {
+        if n < 10 {
+            loop;
+        }
+        y += *i;
+    }
+    assert_eq!(y, 90);
+}

src/test/run-pass/foreach-external-iterators-nested.rs

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+// 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.
+
+fn main() {
+    let x = [1,..100];
+    let y = [2,..100];
+    let mut p = 0;
+    let mut q = 0;
+    foreach i in x.iter() {
+        foreach j in y.iter() {
+            p += *j;
+        }
+        q += *i + p;
+    }
+    assert!(q == 1010100);
+}

src/test/run-pass/foreach-external-iterators.rs

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+// 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.
+
+fn main() {
+    let x = [1,..100];
+    let mut y = 0;
+    foreach i in x.iter() {
+        y += *i
+    }
+    assert!(y == 100);
+}