warning: unused label
  --> $DIR/unused_labels.rs:11:5
   |
LL |     'unused_while_label: while 0 == 0 {
   |     ^^^^^^^^^^^^^^^^^^^
   |
note: lint level defined here
  --> $DIR/unused_labels.rs:8:9
   |
LL | #![warn(unused_labels)]
   |         ^^^^^^^^^^^^^

warning: unused label
  --> $DIR/unused_labels.rs:16:5
   |
LL |     'unused_while_let_label: while let Some(_) = opt {
   |     ^^^^^^^^^^^^^^^^^^^^^^^

warning: unused label
  --> $DIR/unused_labels.rs:20:5
   |
LL |     'unused_for_label: for _ in 0..10 {
   |     ^^^^^^^^^^^^^^^^^

warning: unused label
  --> $DIR/unused_labels.rs:36:9
   |
LL |         'unused_loop_label_inner_2: for _ in 0..10 {
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: unused label
  --> $DIR/unused_labels.rs:42:5
   |
LL |     'unused_loop_label_outer_3: for _ in 0..10 {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: unused label
  --> $DIR/unused_labels.rs:60:5
   |
LL |     'many_used_shadowed: for _ in 0..10 {
   |     ^^^^^^^^^^^^^^^^^^^

warning: unused label
  --> $DIR/unused_labels.rs:72:5
   |
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:62:9
   |
LL |     'many_used_shadowed: for _ in 0..10 {
   |     ------------------- first declared here
LL |
LL |         'many_used_shadowed: for _ in 0..10 {
   |         ^^^^^^^^^^^^^^^^^^^ lifetime 'many_used_shadowed already in scope