_ expressions
Syntax
UnderscoreExpression :
_
Underscore expressions, denoted with the symbol _, are used to signify a
placeholder in a destructuring assignment. They may only appear in the left-hand
side of an assignment.
An example of an _ expression:
#![allow(unused)] fn main() { let p = (1, 2); let mut a = 0; (_, a) = p; }