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loop_break_value: fix tests (but ignore one expected not to compile)

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Diggory Hardy 2017-05-16 18:54:41 +01:00
parent 7488ff5c44
commit 3f980beb3e
1 changed files with 10 additions and 2 deletions
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12
src/doc/unstable-book/src/language-features/loop-break-value.md
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@ -15,6 +15,8 @@ never exits.
A `loop` can instead evaluate to a useful value via *break with value*: A `loop` can instead evaluate to a useful value via *break with value*:
```rust ```rust
#![feature(loop_break_value)]
// Find the first square number over 1000: // Find the first square number over 1000:
let mut n = 1; let mut n = 1;
let square = loop { let square = loop {
@ -28,6 +30,8 @@ let square = loop {
The evaluation type may be specified externally: The evaluation type may be specified externally:
```rust ```rust
#![feature(loop_break_value)]
// Declare that value returned is unsigned 64-bit: // Declare that value returned is unsigned 64-bit:
let n: u64 = loop { let n: u64 = loop {
break 1; break 1;
@ -37,9 +41,11 @@ let n: u64 = loop {
It is an error if types do not agree, either between a "break" value and an external requirement, It is an error if types do not agree, either between a "break" value and an external requirement,
or between multiple "break" values: or between multiple "break" values:
```rust ```no_compile
#![feature(loop_break_value)]
loop { loop {
if random_bool() { if true {
break 1u32; break 1u32;
} else { } else {
break 0u8; // error: types do not agree break 0u8; // error: types do not agree
@ -69,6 +75,8 @@ When no value is given, the value `()` is assumed, thus `break;` is equivalent t
Using a label allows returning a value from an inner loop: Using a label allows returning a value from an inner loop:
```rust ```rust
#![feature(loop_break_value)]
let result = 'outer: loop { let result = 'outer: loop {
for n in 1..10 { for n in 1..10 {
if n > 4 { if n > 4 {