Add tests for new labeled blocks for unused_labels

Author: kylestach

src/test/ui/label_break_value_continue.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(label_break_value)]
+#![allow(unused_labels)]
 
 // Simple continue pointing to an unlabeled break should yield in an error
 fn continue_simple() {

src/test/ui/label_break_value_continue.stderr

@@ -1,25 +1,25 @@
 error[E0695]: unlabeled `continue` inside of a labeled block
-  --> $DIR/label_break_value_continue.rs:16:9
+  --> $DIR/label_break_value_continue.rs:17:9
    |
 LL |         continue; //~ ERROR unlabeled `continue` inside of a labeled block
    |         ^^^^^^^^ `continue` statements that would diverge to or through a labeled block need to bear a label
 
 error[E0696]: `continue` pointing to a labeled block
-  --> $DIR/label_break_value_continue.rs:23:9
+  --> $DIR/label_break_value_continue.rs:24:9
    |
 LL |         continue 'b; //~ ERROR `continue` pointing to a labeled block
    |         ^^^^^^^^^^^ labeled blocks cannot be `continue`'d
    |
 note: labeled block the continue points to
-  --> $DIR/label_break_value_continue.rs:22:5
+  --> $DIR/label_break_value_continue.rs:23:5
    |
 LL | /     'b: {
 LL | |         continue 'b; //~ ERROR `continue` pointing to a labeled block
 LL | |     }
    | |_____^
 
 error[E0695]: unlabeled `continue` inside of a labeled block
-  --> $DIR/label_break_value_continue.rs:31:13
+  --> $DIR/label_break_value_continue.rs:32:13
    |
 LL |             continue; //~ ERROR unlabeled `continue` inside of a labeled block
    |             ^^^^^^^^ `continue` statements that would diverge to or through a labeled block need to bear a label

src/test/ui/label_break_value_unlabeled_break.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(label_break_value)]
+#![allow(unused_labels)]
 
 // Simple unlabeled break should yield in an error
 fn unlabeled_break_simple() {

src/test/ui/label_break_value_unlabeled_break.stderr

@@ -1,11 +1,11 @@
 error[E0695]: unlabeled `break` inside of a labeled block
-  --> $DIR/label_break_value_unlabeled_break.rs:16:9
+  --> $DIR/label_break_value_unlabeled_break.rs:17:9
    |
 LL |         break; //~ ERROR unlabeled `break` inside of a labeled block
    |         ^^^^^ `break` statements that would diverge to or through a labeled block need to bear a label
 
 error[E0695]: unlabeled `break` inside of a labeled block
-  --> $DIR/label_break_value_unlabeled_break.rs:24:13
+  --> $DIR/label_break_value_unlabeled_break.rs:25:13
    |
 LL |             break; //~ ERROR unlabeled `break` inside of a labeled block
    |             ^^^^^ `break` statements that would diverge to or through a labeled block need to bear a label

src/test/ui/lint/unused_labels.rs

@@ -14,6 +14,8 @@
 
 // compile-pass
 
+#![feature(label_break_value)]
+
 fn main() {
     'unused_while_label: while 0 == 0 {
         //~^ WARN unused label
@@ -67,9 +69,18 @@ fn main() {
         }
     }
 
-    // This is diverging, so put it at the end so we don't get
-    // unreachable_code errors everywhere else
     'unused_loop_label: loop {
         //~^ WARN unused label
+        break;
+    }
+
+    // Make sure unused block labels give warnings...
+    'unused_block_label: {
+        //~^ WARN unused label
+    }
+
+    // ...and that used ones don't:
+    'used_block_label: {
+        break 'used_block_label;
     }
 }

src/test/ui/lint/unused_labels.stderr

@@ -1,37 +1,37 @@
 warning: unused label
-  --> $DIR/unused_labels.rs:18:5
+  --> $DIR/unused_labels.rs:20:5
    |
 LL |     'unused_while_label: while 0 == 0 {
    |     ^^^^^^^^^^^^^^^^^^^
    |
    = note: #[warn(unused_labels)] on by default
 
 warning: unused label
-  --> $DIR/unused_labels.rs:23:5
+  --> $DIR/unused_labels.rs:25:5
    |
 LL |     'unused_while_let_label: while let Some(_) = opt {
    |     ^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: unused label
-  --> $DIR/unused_labels.rs:27:5
+  --> $DIR/unused_labels.rs:29:5
    |
 LL |     'unused_for_label: for _ in 0..10 {
    |     ^^^^^^^^^^^^^^^^^
 
 warning: unused label
-  --> $DIR/unused_labels.rs:43:9
+  --> $DIR/unused_labels.rs:45:9
    |
 LL |         'unused_loop_label_inner_2: for _ in 0..10 {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: unused label
-  --> $DIR/unused_labels.rs:49:5
+  --> $DIR/unused_labels.rs:51:5
    |
 LL |     'unused_loop_label_outer_3: for _ in 0..10 {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 warning: unused label
-  --> $DIR/unused_labels.rs:58:5
+  --> $DIR/unused_labels.rs:60:5
    |
 LL |     'many_used_shadowed: for _ in 0..10 {
    |     ^^^^^^^^^^^^^^^^^^^
@@ -42,8 +42,14 @@ warning: unused label
 LL |     'unused_loop_label: loop {
    |     ^^^^^^^^^^^^^^^^^^
 
+warning: unused label
+  --> $DIR/unused_labels.rs:78:5
+   |
+LL |     'unused_block_label: {
+   |     ^^^^^^^^^^^^^^^^^^^
+
 warning: label name `'many_used_shadowed` shadows a label name that is already in scope
-  --> $DIR/unused_labels.rs:60:9
+  --> $DIR/unused_labels.rs:62:9
    |
 LL |     'many_used_shadowed: for _ in 0..10 {
    |     ------------------- first declared here