rustLogic errorMedium

Channel receiver try_recv() error handling issue

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BugFind the bug and fix the code

What it should do

Process messages from a channel receiver and handle errors appropriately. Example: process_messages(rx) -> ()

What happens instead

Panic: 'called `Result::unwrap()` on an `Err` value: TryRecvError(Empty)'

use std::sync::mpsc::channel;

fn process_messages(rx: std::sync::mpsc::Receiver<i32>) {
    // Panics on empty channel with unwrap
    let msg = rx.try_recv().unwrap();
    println!("Received: {}", msg);
}

fn main() {
    let (tx, rx) = channel();
    tx.send(1).unwrap();
    process_messages(rx);
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

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This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

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use std::sync::mpsc::channel; fn process_messages(rx: std::sync::mpsc::Receiver<i32>) { // Panics on empty channel with unwrap let msg = rx.try_recv().unwrap(); println!("Received: {}", msg); } fn main() { let (tx, rx) = channel(); tx.send(1).unwrap(); process_messages(rx); }

Channel receiver try_recv() error handling issue

What it should do

What happens instead

More logic errors to practise

Channel receiver try_recv() error handling issue

What it should do

What happens instead

More logic errors to practise