Implementing the Question Mark Operator (?) in Rust

The question mark operator (?) in Rust is a powerful tool for concisely handling errors. It propagates errors up the call stack, simplifying error handling code and making it more readable. This challenge asks you to implement a simplified version of this operator to understand its underlying mechanism.

Problem Description

Your task is to create a function try that mimics the behavior of the question mark operator (?). The try function should take a Result<T, E> as input and return a Result<T, E>. If the Result is Ok(value), the try function should return Ok(value). If the Result is Err(error), the try function should immediately return Err(error). Essentially, you're implementing a simplified error propagation mechanism.

Key Requirements:

• The function must accept a Result<T, E> where T is the success type and E is the error type.
• The function must return a Result<T, E> with the same success and error types.
• If the input Result is Ok, the function must return Ok with the contained value.
• If the input Result is Err, the function must return Err with the contained error.

Expected Behavior:

The try function should act as a shortcut for explicitly matching on the Result and returning early on an error. It should provide a clean and concise way to propagate errors.

Edge Cases to Consider:

• The function should handle any valid Result<T, E> types.
• Consider the potential for generic types T and E.

Examples

Example 1:

Input: Ok(5)
Output: Ok(5)
Explanation: The input is an Ok variant, so the function simply returns the contained value.

Example 2:

Input: Err("Something went wrong")
Output: Err("Something went wrong")
Explanation: The input is an Err variant, so the function immediately returns the contained error.

Example 3:

Input: Result<i32, String>::Ok(10)
Output: Result<i32, String>::Ok(10)
Explanation: Demonstrates handling a specific Result type with i32 success and String error.

Constraints

• The function must be generic over the success type T and the error type E.
• The function must be implemented using Rust's standard library features.
• The function should be as concise and readable as possible.

Notes

Think about how the question mark operator simplifies error handling in Rust. Your try function should achieve a similar level of conciseness. Consider using pattern matching to handle the Ok and Err variants of the Result type. The goal is to understand the core functionality of the ? operator, not to replicate all its features (like macro expansion).