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Clean up E0373 explanation #69480

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Feb 27, 2020
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Clean up E0373 explanation #69480

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10 changes: 7 additions & 3 deletions src/librustc_error_codes/error_codes/E0373.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
This error occurs when an attempt is made to use data captured by a closure,
when that data may no longer exist. It's most commonly seen when attempting to
return a closure:
A captured variable in a closure may not live long enough.

Erroneous code example:

```compile_fail,E0373
fn foo() -> Box<Fn(u32) -> u32> {
Expand All @@ -9,6 +9,10 @@ fn foo() -> Box<Fn(u32) -> u32> {
}
```

This error occurs when an attempt is made to use data captured by a closure,
when that data may no longer exist. It's most commonly seen when attempting to
return a closure as shown in the previous code example.

Notice that `x` is stack-allocated by `foo()`. By default, Rust captures
closed-over data by reference. This means that once `foo()` returns, `x` no
longer exists. An attempt to access `x` within the closure would thus be
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