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Oct 14, 2019
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Add long error explanation for E0697 #65215

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Add long error explanation for E0697
JohnTitor Oct 8, 2019
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JohnTitor Oct 13, 2019
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19 changes: 18 additions & 1 deletion src/librustc/error_codes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2001,6 +2001,24 @@ a (non-transparent) struct containing a single float, while `Grams` is a
transparent wrapper around a float. This can make a difference for the ABI.
"##,

E0697: r##"
A closure has been used as `static`.

Erroneous code example:

```compile_fail,E0697
fn main() {
static || {}; // used as `static`
}
```

Closures cannot be used as `static`. They "save" the environment.
Therefore, having a static closure with a static environment doesn't
really make sense since all you can capture inside it would be variables
with static lifetime. In this condition, better use a function directly.
The easiest fix is to remove `static` keyword.
"##,

E0698: r##"
When using generators (or async) all type variables must be bound so a
generator can be constructed.
Expand Down Expand Up @@ -2187,7 +2205,6 @@ See [RFC 2091] for details on this and other limitations.
E0657, // `impl Trait` can only capture lifetimes bound at the fn level
E0687, // in-band lifetimes cannot be used in `fn`/`Fn` syntax
E0688, // in-band lifetimes cannot be mixed with explicit lifetime binders
E0697, // closures cannot be static
// E0707, // multiple elided lifetimes used in arguments of `async fn`
E0708, // `async` non-`move` closures with parameters are not currently
// supported
Expand Down
1 change: 1 addition & 0 deletions src/test/ui/static/static-closures.stderr
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Expand Up @@ -6,3 +6,4 @@ LL | static || {};

error: aborting due to previous error

For more information about this error, try `rustc --explain E0697`.