Check character boundaries in Rust

rust
When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```

Install this rule for wispbit

Add this rule to wispbit and it will run when you open a pull request

Install this rule for Coderabbit

Copy the configuration below and add it to your repository as .coderabbit.yml in your project root.

reviews:
  path_instructions:
    - path: "*.rs"
      instructions: |
                
        When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
        
        Bad:
        
        ```rust
        // This can cause a panic if truncation happens in the middle of a multi-byte character
        let mut value = some_string;
        value.truncate(limit);
        ```
        
        Good:
        
        ```rust
        // Check character boundaries before truncating
        let mut value = some_string;
        let mut index = limit;
        while !value.is_char_boundary(index) {
            index -= 1;
        }
        value.truncate(index);
        ```

Install this rule for Greptile

Greptile rules can be added through the web interface. Please see this documentation for details on how to add custom rules and context.

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```

File Path Patterns:

*.rs

Install this rule for GitHub Copilot

Copilot instructions can be added through the interface. See the documentation for details on how to create coding guidelines.

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```

File Path Patterns:

*.rs

Install this rule for Graphite Diamond

Diamond custom rules can be added through the interface. See the documentation for details on how to create custom rules.

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```

File Path Patterns:

*.rs

Use with Cline

Copy the rule below and ask Cline to review your code using this rule

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```

Use with OpenAI Codex

Copy the rule below and ask OpenAI Codex to review your code using this rule

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```

Use with Cursor

Copy the rule below and ask Cursor to review your code using this rule

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```

Use with Claude Code

Copy the rule below and ask Claude Code to review your code using this rule

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```

Install this rule for Windsurf

To set up rules for Windsurf Reviews, please see this documentation 

When truncating strings, ensure you check character boundaries to prevent panics with multi-byte UTF-8 characters.
Bad:
```rust
// This can cause a panic if truncation happens in the middle of a multi-byte character
let mut value = some_string;
value.truncate(limit);
```
Good:
```rust
// Check character boundaries before truncating
let mut value = some_string;
let mut index = limit;
while !value.is_char_boundary(index) {
    index -= 1;
}
value.truncate(index);
```