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Question: Indexing a tuple using a macro in Rust unexpected token
Time: Asked 74 minute ago
Modified: Asked 20 minute ago
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Indexing a tuple using a macro in Rust unexpected token

In Rust, macros are used to generate code at compile-time, and they operate on Rust’s Abstract Syntax Tree (AST). When you try to index a tuple using a macro in Rust, you might encounter an “unexpected token” error if your macro code is not generating valid Rust syntax.

Here’s an example of how to index a tuple using a macro in Rust:

rust
macro_rules! get_second {
    // Matches a tuple with two elements and returns the second element
    ($x:expr, $y:expr) => {
        $y
    };
}

fn main() {
    let tuple = (1, 2);
    let second = get_second!(tuple.0, tuple.1);
    println!("{}", second); // Output: 2
}

In this example, we define a macro get_second! that takes two expressions as arguments and returns the second expression. In the main() function, we create a tuple and use the macro to index it and retrieve the second element.

Make sure that your macro’s output generates valid Rust syntax. If you’re still encountering an “unexpected token” error, make sure to double-check your macro’s syntax and usage.

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Tuple Issue · Issue #41081 · Rust-Lang/Rust · Github

Tuples In For Loops - The Rust Programming Language Forum — Tuples In For Loops – The Rust Programming Language Forum

Unexpected Token In Input When Proptest! In File · Issue #6747 · Rust-Lang/ Rust-Analyzer · Github

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