E0038: Emit, raise, or runtime keyword not needed

You used the emit, raise, or runtime keyword to call a function that does not need it.

Example

fn regular_function() -> i64 {
    42
}

fn main() {
    let x = runtime regular_function();  // Error: `runtime` can only be used with runtime function calls
}

How to fix

Remove the keyword:

fn regular_function() -> i64 {
    42
}

fn main() {
    let x = regular_function();  // OK - no runtime keyword needed
}