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E0716: clarify that equivalent code example is erroneous #86477

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Jul 5, 2021
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E0716: clarify that equivalent code example is erroneous #86477

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6 changes: 4 additions & 2 deletions compiler/rustc_error_codes/src/error_codes/E0716.md
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Original file line number Diff line number Diff line change
Expand Up @@ -14,14 +14,16 @@ Here, the expression `&foo()` is borrowing the expression `foo()`. As `foo()` is
a call to a function, and not the name of a variable, this creates a
**temporary** -- that temporary stores the return value from `foo()` so that it
can be borrowed. You could imagine that `let p = bar(&foo());` is equivalent to
this:
the following, which uses an explicit temporary variable.

Erroneous code example:

```compile_fail,E0597
# fn foo() -> i32 { 22 }
# fn bar(x: &i32) -> &i32 { x }
let p = {
let tmp = foo(); // the temporary
bar(&tmp)
bar(&tmp) // error: `tmp` does not live long enough
}; // <-- tmp is freed as we exit this block
let q = p;
```
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