You are given a code snippet that is a part of a larger parser implementation. The code snippet is written in a Rust programming language.

The code snippet shows the implementation of a match statement with three branches. Each branch handles a different variant of a `Token` enum. The first branch matches the `Ok` variant of `Token::LBracket` and calls a method `array_selector()`. The second branch matches the `Ok` variant of `Token::PredicateStart` and calls a method `predicate_selector()`. The third branch matches any other variant (`Ok(other)`) and returns an error.

Your task is to implement the two missing methods `array_selector()` and `predicate_selector()`. You need to write these methods in a way that they perform operations based on the specific `Token` variant they are called with. You can assume that the given `Token` variants are the only ones that will be encountered.

Write the code for `array_selector()` and `predicate_selector()` methods.
user
Sure, I'd be happy to help you implement `array_selector()` and `predicate_selector()` methods in Rust. However, please remember that I am not able to access the specific context of your code snippet or see what the `Token` enum or other types look like. So, I'll provide a general Rust implementation as examples.

In Rust, a `match` statement can be used to handle different variant branches. Here's what a general implementation for `array_selector()` and `predicate_selector()` might look like:

```rust
enum Token {
    LBracket,
    PredicateStart,
    // … other variants
}

impl Token {
    // ...
}

struct Parser {
    // … some state
}

impl Parser {
    fn new() -> Parser {
        // … init state
    }

    fn parse(&mut self, tokens: &[Token]) -> Result<&[Token], &str> {
        // … check for tokens, …

        match tokens.first() {
            Some(Token::LBracket) => {
                // Perform operation for LBracket
                // Return remaining tokens
                return Ok(tokens.slice(1..));
            },
            Some(Token::PredicateStart) => {
                // Perform operation for PredicateStart
                // Return remaining tokens
                return Ok(tokens.slice(1..));
            },
            // If this is the last token, no need to slice array
            None => return Err("Array does not start with LBracket or PredicateStart."),
            _ => continue, // skip other variants
        };
    }

    fn array_selector(&mut self, tokens: &[Token]) -> Result<String, &str> {
        match tokens.first() {
            Some(Token::LBracket) => {
                // Perform operation for LBracket and return a string
                return Ok("Selected first array".to_string());
            },
            Some(Token::PredicateStart) => {
                // Perform operation for PredicateStart and return a string
                return Ok("Selected first predicate".to_string());
            },
            // If this is the last token, no need to slice array
            None => return Err("Array does not start with LBracket or PredicateStart."),
            _ => continue, // skip other variants
        }
    }

    fn predicate_selector(&mut self, tokens: &[Token]) -> Result<&str, &str> {
        if let Some(token) = tokens.first() {
            match token {
                Token::PredicateStart => {
                    let predicate_tokens = tokens.slice(1..);
                    return Ok(self.parse_predicate(predicate_tokens)?);
                },
                _ => continue, // skip other variants
            }
        } else {
            return Err("Array does not start with LBracket or PredicateStart. ");
        }
    }

    fn parse_predicate(&mut self, tokens: &[Token]) -> Result<&str, &str> {
        // … parse predicate, return result as String
    }
}
```

This is a general framework showing how you can parse `Token`s and perform operations. Please adapt it to your specific `Token` enumeration and `Parser` structure.
assistant
You are given a code snippet that is a part of a larger parser implementation. The code snippet is written in a Rust programming language.

The code snippet shows the implementation of a match statement with three branches. Each branch handles a different variant of a `Token` enum. The first branch matches the `Ok` variant of `Token::LBracket` and calls a method `array_selector()`. The second branch matches the `Ok` variant of `Token::PredicateStart` and calls a method `predicate_selector()`. The third branch matches any other variant (`Ok(other)`) and returns an error.

Your task is to implement the two missing methods `array_selector()` and `predicate_selector()`. You need to write these methods in a way that they perform operations based on the specific `Token` variant they are called with. You can assume that the given `Token` variants are the only ones that will be encountered.

Write the code for `array_selector()` and `predicate_selector()` methods.
user
Sure, I can help you with that. However, without knowing the exact context and the desired functionality of these methods, I'll provide a basic implementation. You might need to adjust it according to your needs.

Here's a basic implementation of `array_selector()` and `predicate_selector()` methods:

```rust
enum Token {
    LBracket,
    PredicateStart,
    // other variants...
}

// Assuming that you have some sort of Parser struct
struct Parser {
    // fields...
}

impl Parser {
    // Assuming that array_selector is supposed to handle the LBracket Token
    fn array_selector(&mut self, token: Token) -> Result<(), &'static str> {
        match token {
            Token::LBracket => {
                // Handle array selector logic here
                // This is just a placeholder
                println!("Handling array selector...");
                Ok(())
            }
            _ => Err("Invalid token for array selector"),
        }
    }

    // Assuming that predicate_selector is supposed to handle the PredicateStart Token
    fn predicate_selector(&mut self, token: Token) -> Result<(), &'static str> {
        match token {
            Token::PredicateStart => {
                // Handle predicate selector logic here
                // This is just a placeholder
                println!("Handling predicate selector...");
                Ok(())
            }
            _ => Err("Invalid token for predicate selector"),
        }
    }
}
```

In this implementation, `array_selector()` and `predicate_selector()` methods take a `Token` as an argument and return a `Result` type. They match on the given `Token` and perform some operation if the `Token` is `LBracket` or `PredicateStart` respectively. If the `Token` is not the expected one, they return an error.
assistant