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6906e64c30
Improve errors for incomplete functions in struct definitions
Given the following code:
```rust
fn main() {}
struct Foo {
fn
}
```
[playground](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=29139f870511f6918324be5ddc26c345)
The current output is:
```
Compiling playground v0.0.1 (/playground)
error: functions are not allowed in struct definitions
--> src/main.rs:4:5
|
4 | fn
| ^^
|
= help: unlike in C++, Java, and C#, functions are declared in `impl` blocks
= help: see https://doc.rust-lang.org/book/ch05-03-method-syntax.html for more information
error: could not compile `playground` due to previous error
```
In this case, rustc should suggest escaping `fn` to use it as an identifier.