rustScope errorMedium

Partial move from struct prevents usage

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What it should do

Extract user id and name into formatted string. Example: extract_user_info(1, "Alice") -> "1: Alice"

What happens instead

Compiler error: use of partially moved value 'user'

struct User {
    id: i32,
    name: String,
}

fn extract_user_info(id: i32, name: &str) -> String {
    let user = User { id, name: name.to_string() };
    let user_name = user.name; // Moves user.name out of user
    // Attempting to access user after partial move fails
    format!("{}: {}", user.id, user_name)
}

fn main() {
    println!("{}", extract_user_info(1, "Alice"));
}

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 scope and closure bugs pattern

Every callback reports the last value, a counter never increments, UnboundLocalError on a variable you can see.

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struct User { id: i32, name: String, } fn extract_user_info(id: i32, name: &str) -> String { let user = User { id, name: name.to_string() }; let user_name = user.name; // Moves user.name out of user // Attempting to access user after partial move fails format!("{}: {}", user.id, user_name) } fn main() { println!("{}", extract_user_info(1, "Alice")); }

Partial move from struct prevents usage

What it should do

What happens instead

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Partial move from struct prevents usage

What it should do

What happens instead

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