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/// Replaces a variable by another that is calculated by the `predicate`.
pub fn replace_by<T, P: FnOnce() -> T>(dest: &mut T, predicate: P) -> T {
std::mem::replace(dest, predicate())
}
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/// Replaces a variable by another that is calculated by the `predicate`.
pub fn replace_by<T, P: FnOnce() -> T>(dest: &mut T, predicate: P) -> T {
std::mem::replace(dest, predicate())
}