tests for duplicate label detection.

Author: pnkfelix

src/test/compile-fail/loops-reject-duplicate-labels-2.rs

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+// 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.
+
+// Issue #21633: reject duplicate loop labels in function bodies.
+//
+// This is testing the generalization (to the whole function body)
+// discussed here:
+// http://internals.rust-lang.org/t/psa-rejecting-duplicate-loop-labels/1833
+
+fn main() {
+    { 'fl: for _ in 0..10 { break; } }   //~ NOTE first label occurrence here
+    { 'fl: loop { break; } }             //~ ERROR duplicate loop label 'fl in function
+
+    { 'lf: loop { break; } }             //~ NOTE first label occurrence here
+    { 'lf: for _ in 0..10 { break; } }   //~ ERROR duplicate loop label 'lf in function
+
+    { 'wl: while 2 > 1 { break; } }      //~ NOTE first label occurrence here
+    { 'wl: loop { break; } }             //~ ERROR duplicate loop label 'wl in function
+
+    { 'lw: loop { break; } }             //~ NOTE first label occurrence here
+    { 'lw: while 2 > 1 { break; } }      //~ ERROR duplicate loop label 'lw in function
+
+    { 'fw: for _ in 0..10 { break; } }   //~ NOTE first label occurrence here
+    { 'fw: while 2 > 1 { break; } }      //~ ERROR duplicate loop label 'fw in function
+
+    { 'wf: while 2 > 1 { break; } }      //~ NOTE first label occurrence here
+    { 'wf: for _ in 0..10 { break; } }   //~ ERROR duplicate loop label 'wf in function
+
+    { 'tl: while let Some(_) = None::<i32> { break; } } //~ NOTE first label occurrence here
+    { 'tl: loop { break; } }             //~ ERROR duplicate loop label 'tl in function
+
+    { 'lt: loop { break; } }             //~ NOTE first label occurrence here
+    { 'lt: while let Some(_) = None::<i32> { break; } }
+                                        //~^ ERROR duplicate loop label 'lt in function
+}

src/test/compile-fail/loops-reject-duplicate-labels.rs

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+// 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.
+
+// Issue #21633: reject duplicate loop labels in function bodies.
+// This is testing the exact cases that are in the issue description.
+
+fn main() {
+    'fl: for _ in 0..10 { break; } //~ NOTE first label occurrence here
+    'fl: loop { break; }           //~ ERROR duplicate loop label 'fl in function
+
+    'lf: loop { break; }           //~ NOTE first label occurrence here
+    'lf: for _ in 0..10 { break; } //~ ERROR duplicate loop label 'lf in function
+
+    'wl: while 2 > 1 { break; }    //~ NOTE first label occurrence here
+    'wl: loop { break; }           //~ ERROR duplicate loop label 'wl in function
+
+    'lw: loop { break; }           //~ NOTE first label occurrence here
+    'lw: while 2 > 1 { break; }    //~ ERROR duplicate loop label 'lw in function
+
+    'fw: for _ in 0..10 { break; } //~ NOTE first label occurrence here
+    'fw: while 2 > 1 { break; }    //~ ERROR duplicate loop label 'fw in function
+
+    'wf: while 2 > 1 { break; }    //~ NOTE first label occurrence here
+    'wf: for _ in 0..10 { break; } //~ ERROR duplicate loop label 'wf in function
+
+    'tl: while let Some(_) = None::<i32> { break; } //~ NOTE first label occurrence here
+    'tl: loop { break; }           //~ ERROR duplicate loop label 'tl in function
+
+    'lt: loop { break; }           //~ NOTE first label occurrence here
+    'lt: while let Some(_) = None::<i32> { break; }
+                                  //~^ ERROR duplicate loop label 'lt in function
+}