New Lint: function argument only used in recursion #8390
Description
What it does
Arguments that are used only in recursion to itself.
Since it is used, the warning unused_variables does not come out, but it is useless.
Lint Name
only_used_in_recursion
Category
perf
Advantage
- Lowers the complexity of the function.
- Better performance when the useless argument have some operation (like below example)
Drawbacks
No response
Example
fn f(a: usize, b: usize) -> usize {
if a == 0 {
1
} else {
f(a - 1, b + 1)
}
}
fn main() {
print!("{}", f(1, 1));
}Could be written as:
fn f(a: usize) -> usize {
if a == 0 {
1
} else {
f(a - 1)
}
}
fn main() {
print!("{}", f(1));
}