Function clippy_utils::sugg::associativity

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fn associativity(op: AssocOp) -> Associativity
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Returns the associativity/fixity of an operator. The difference with AssocOp::fixity is that an operator can be both left and right associative (such as +: a + b + c == (a + b) + c == a + (b + c).

Chained as and explicit : type coercion never need inner parenthesis so they are considered associative.