Add a file with test cases

src/test/run-pass/label_break_value.rs

@@ -0,0 +1,121 @@
+// Copyright 2018 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 control flow to follow label_break_value semantics
+fn label_break(a: bool, b: bool) -> u32 {
+    let mut v = 0;
+    'b: {
+        v = 1;
+        if a {
+            break 'b;
+        }
+        v = 2;
+        if b {
+            break 'b;
+        }
+        v = 3;
+    }
+    return v;
+}
+
+// Test that values can be returned
+fn break_value(a: bool, b: bool) -> u32 {
+    let result = 'block: {
+        if a { break 'block 1; }
+        if b { break 'block 2; }
+        3
+    };
+    result
+}
+
+// Test nesting of labeled blocks
+// here we only check that it compiles
+fn label_break_nested() {
+    'b: {
+        println!("hi");
+        if false {
+            break 'b;
+        }
+        'c: {
+            if false {
+                break 'b;
+            }
+            break 'c;
+        }
+        println!("hello");
+        if true {
+            break 'b;
+        }
+    }
+}
+
+// Tests for mixing labeled blocks with loop constructs
+// This function should be the identity function
+fn label_break_mixed(v: u32) -> u32 {
+    let mut r = 0;
+    'b: {
+        // Unlabeled break still works
+        // (only crossing boundaries is an error)
+        loop {
+            break;
+        }
+        if v == 0 {
+            break 'b;
+        }
+        // Labeled breaking an inner loop still works
+        'c: loop {
+            if r == 1 {
+                break 'c;
+            }
+            r += 1;
+        }
+        assert_eq!(r, 1);
+        if v == 1 {
+            break 'b;
+        }
+        // Labeled breaking an outer loop still works
+        'd: loop {
+            'e: {
+                if v == r {
+                    break 'b;
+                }
+                if r == 5 {
+                    break 'd;
+                }
+                r += 1;
+            }
+        }
+        assert_eq!(r, 5);
+        assert!(v > r);
+        // Here we test return from inside a labeled block
+        return v;
+    }
+    r
+}
+
+pub fn main() {
+    assert_eq!(label_break(true, false), 1);
+    assert_eq!(label_break(false, true), 2);
+    assert_eq!(label_break(false, false), 3);
+
+    assert_eq!(break_value(true, false), 1);
+    assert_eq!(break_value(false, true), 2);
+    assert_eq!(break_value(false, false), 3);
+
+    assert_eq!(label_break_mixed(0), 0);
+    assert_eq!(label_break_mixed(1), 1);
+    assert_eq!(label_break_mixed(2), 2);
+    assert_eq!(label_break_mixed(3), 3);
+    assert_eq!(label_break_mixed(4), 4);
+    assert_eq!(label_break_mixed(5), 5);
+    assert_eq!(label_break_mixed(6), 6);
+
+    // FIXME: ensure that labeled blocks work if produced by macros and in match arms
+}