An invalid number of arguments was passed when calling a function.
Erroneous code example:
fn f(u: i32) {}
f(); // error!The number of arguments passed to a function must match the number of arguments specified in the function signature.
For example, a function like:
fn f(a: u16, b: &str) {}Must always be called with exactly two arguments, e.g., f(2, "test").
Note that Rust does not have a notion of optional function arguments or variadic functions (except for its C-FFI).