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4e282795d7
Suggest `br` if the unknown string prefix `rb` is found
Currently, for the following code:
```rust
fn main() {
rb"abc";
}
```
we issue the following suggestion:
```
help: consider inserting whitespace here
|
2 | rb "abc";
| --
```
With my changes (only in edition 2021, where unknown prefixes became an error), I get:
```
help: use `br` for a raw byte string
|
2 | br"abc";
| ^^
```