Fix not complete format!("{{{$0") and underscore
#21210
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+87
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Example
---
```rust
fn main() {
let foobar = 1;
format_args!("{{{f$0");
}
```
**Before this PR**
No complete
**After this PR**
```rust
fn main() {
let foobar = 1;
format_args!("{{{foobar");
}
```
---
```rust
fn main() {
let foo_bar = 1;
format_args!("{foo_$0}");
}
```
**Before this PR**
No complete
**After this PR**
```rust
fn main() {
let foo_bar = 1;
format_args!("{foo_bar}");
}
```
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Example
Before this PR
No complete
After this PR
Before this PR
No complete
After this PR