warning: label name `'a` shadows a label name that is already in scope
  --> $DIR/loop-break-value.rs:140:17
   |
LL |     'a: loop {
   |     -- first declared here
LL |         break;
LL |         let _ = 'a: loop {
   |                 ^^ label `'a` already in scope

warning: label name `'a` shadows a label name that is already in scope
  --> $DIR/loop-break-value.rs:152:17
   |
LL |     'a: loop {
   |     -- first declared here
LL |         break;
LL |         let _ = 'a: loop {
   |                 ^^ label `'a` already in scope

error[E0425]: cannot find value `LOOP` in this scope
  --> $DIR/loop-break-value.rs:99:15
   |
LL |     'LOOP: for _ in 0 .. 9 {
   |     ----- a label with a similar name exists
LL |         break LOOP;
   |               ^^^^
   |               |
   |               not found in this scope
   |               help: use the similarly named label: `'LOOP`

warning: denote infinite loops with `loop { ... }`
  --> $DIR/loop-break-value.rs:30:5
   |
LL |     'while_loop: while true {
   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: use `loop`
   |
   = note: `#[warn(while_true)]` on by default

error[E0571]: `break` with value from a `while` loop
  --> $DIR/loop-break-value.rs:32:9
   |
LL |     'while_loop: while true {
   |     ----------------------- you can't `break` with a value in a `while` loop
LL |         break;
LL |         break ();
   |         ^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `while` loop
   |
LL |         break;
   |         ~~~~~
help: alternatively, you might have meant to use the available loop label
   |
LL |         break 'while_loop;
   |               ~~~~~~~~~~~

error[E0571]: `break` with value from a `while` loop
  --> $DIR/loop-break-value.rs:34:13
   |
LL |     'while_loop: while true {
   |     ----------------------- you can't `break` with a value in a `while` loop
...
LL |             break 'while_loop 123;
   |             ^^^^^^^^^^^^^^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `while` loop
   |
LL |             break 'while_loop;
   |             ~~~~~~~~~~~~~~~~~

error[E0571]: `break` with value from a `while` loop
  --> $DIR/loop-break-value.rs:42:12
   |
LL |     while let Some(_) = Some(()) {
   |     ---------------------------- you can't `break` with a value in a `while` loop
LL |         if break () {
   |            ^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `while` loop
   |
LL |         if break {
   |            ~~~~~

error[E0571]: `break` with value from a `while` loop
  --> $DIR/loop-break-value.rs:47:9
   |
LL |     while let Some(_) = Some(()) {
   |     ---------------------------- you can't `break` with a value in a `while` loop
LL |         break None;
   |         ^^^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `while` loop
   |
LL |         break;
   |         ~~~~~

error[E0571]: `break` with value from a `while` loop
  --> $DIR/loop-break-value.rs:53:13
   |
LL |     'while_let_loop: while let Some(_) = Some(()) {
   |     --------------------------------------------- you can't `break` with a value in a `while` loop
LL |         loop {
LL |             break 'while_let_loop "nope";
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `while` loop
   |
LL |             break 'while_let_loop;
   |             ~~~~~~~~~~~~~~~~~~~~~

error[E0571]: `break` with value from a `for` loop
  --> $DIR/loop-break-value.rs:60:9
   |
LL |     for _ in &[1,2,3] {
   |     ----------------- you can't `break` with a value in a `for` loop
LL |         break ();
   |         ^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `for` loop
   |
LL |         break;
   |         ~~~~~

error[E0571]: `break` with value from a `for` loop
  --> $DIR/loop-break-value.rs:61:9
   |
LL |     for _ in &[1,2,3] {
   |     ----------------- you can't `break` with a value in a `for` loop
LL |         break ();
LL |         break [()];
   |         ^^^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `for` loop
   |
LL |         break;
   |         ~~~~~

error[E0571]: `break` with value from a `for` loop
  --> $DIR/loop-break-value.rs:68:13
   |
LL |     'for_loop: for _ in &[1,2,3] {
   |     ---------------------------- you can't `break` with a value in a `for` loop
...
LL |             break 'for_loop Some(17);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^ can only break with a value inside `loop` or breakable block
   |
help: use `break` on its own without a value inside this `for` loop
   |
LL |             break 'for_loop;
   |             ~~~~~~~~~~~~~~~

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:4:31
   |
LL |     let val: ! = loop { break break; };
   |         ---      ----         ^^^^^ expected `!`, found `()`
   |         |        |
   |         |        this loop is expected to be of type `!`
   |         expected because of this assignment
   |
   = note:   expected type `!`
           found unit type `()`

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:11:19
   |
LL |             break "asdf";
   |             ------------ expected because of this `break`
LL |         } else {
LL |             break 123;
   |                   ^^^ expected `&str`, found integer

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:16:15
   |
LL |     let _: i32 = loop {
   |         -        ---- this loop is expected to be of type `i32`
   |         |
   |         expected because of this assignment
LL |         break "asdf";
   |               ^^^^^^ expected `i32`, found `&str`

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:21:31
   |
LL |     let _: i32 = 'outer_loop: loop {
   |         -                     ---- this loop is expected to be of type `i32`
   |         |
   |         expected because of this assignment
LL |         loop {
LL |             break 'outer_loop "nope";
   |                               ^^^^^^ expected `i32`, found `&str`

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:27:9
   |
LL |     let _: Option<String> = loop {
   |         -                   ---- this loop is expected to be of type `Option<String>`
   |         |
   |         expected because of this assignment
LL |         break;
   |         ^^^^^ expected `Option<String>`, found `()`
   |
   = note:   expected enum `Option<String>`
           found unit type `()`
help: give the `break` a value of the expected type
   |
LL |         break None;
   |               ++++

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:77:26
   |
LL |                 break;
   |                 ----- expected because of this `break`
LL |                 break 'c 123;
   |                          ^^^ expected `()`, found integer

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:84:15
   |
LL |         break (break, break);
   |               ^-----^^-----^
   |               ||      |
   |               ||      expected because of this `break`
   |               |expected because of this `break`
   |               expected `()`, found `(!, !)`
   |
   = note: expected unit type `()`
                  found tuple `(!, !)`

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:89:15
   |
LL |         break;
   |         ----- expected because of this `break`
LL |         break 2;
   |               ^ expected `()`, found integer

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:94:9
   |
LL |         break 2;
   |         ------- expected because of this `break`
LL |         break;
   |         ^^^^^ expected integer, found `()`
   |
help: give the `break` a value of the expected type
   |
LL |         break /* value */;
   |               +++++++++++

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:112:9
   |
LL |                     break 'a 1;
   |                     ---------- expected because of this `break`
...
LL |         break;
   |         ^^^^^ expected integer, found `()`
   |
help: give the `break` a value of the expected type
   |
LL |         break /* value */;
   |               +++++++++++

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:124:9
   |
LL |                     break 'a 1;
   |                     ---------- expected because of this `break`
...
LL |         break 'a;
   |         ^^^^^^^^ expected integer, found `()`
   |
help: give the `break` a value of the expected type
   |
LL |         break 'a /* value */;
   |                  +++++++++++

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:135:15
   |
LL |         break;
   |         ----- expected because of this `break`
...
LL |         break 2;
   |               ^ expected `()`, found integer

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:144:17
   |
LL |             break 2;
   |             ------- expected because of this `break`
LL |             loop {
LL |                 break 'a;
   |                 ^^^^^^^^ expected integer, found `()`
   |
help: give the `break` a value of the expected type
   |
LL |                 break 'a /* value */;
   |                          +++++++++++

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:147:15
   |
LL |         break;
   |         ----- expected because of this `break`
...
LL |         break 2;
   |               ^ expected `()`, found integer

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:156:17
   |
LL |             break 'a 2;
   |             ---------- expected because of this `break`
LL |             loop {
LL |                 break 'a;
   |                 ^^^^^^^^ expected integer, found `()`
   |
help: give the `break` a value of the expected type
   |
LL |                 break 'a /* value */;
   |                          +++++++++++

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:159:15
   |
LL |         break;
   |         ----- expected because of this `break`
...
LL |         break 2;
   |               ^ expected `()`, found integer

error[E0308]: mismatched types
  --> $DIR/loop-break-value.rs:163:15
   |
LL | fn main() {
   |          - expected `()` because of this return type
...
LL |     loop { // point at the return type
   |     ---- this loop is expected to be of type `()`
LL |         break 2;
   |               ^ expected `()`, found integer

error: aborting due to 26 previous errors; 3 warnings emitted

Some errors have detailed explanations: E0308, E0425, E0571.
For more information about an error, try `rustc --explain E0308`.