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The address of temporary value was taken.
Erroneous code example:
```compile_fail,E0745
# #![feature(raw_ref_op)]
fn temp_address() {
let ptr = &raw const 2; // error!
}
```
In this example, `2` is destroyed right after the assignment, which means that
`ptr` now points to an unavailable location.
To avoid this error, first bind the temporary to a named local variable:
```
# #![feature(raw_ref_op)]
fn temp_address() {
let val = 2;
let ptr = &raw const val; // ok!
}
```
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