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Expressions that syntactically contain an “exterior” struct literal i.e., not surrounded by any
parens or other delimiters, e.g.,
X { y: 1 }, X { y: 1 }.method(), foo == X { y: 1 } and
X { y: 1 } == foo all do, but (X { y: 1 }) == foo does not.Suppose we have
let _ = e and the order of e.
Is the order such that e in let _ = e needs parentheses when it is on the RHS?In
let p = e, operators with precedence <= this one requires parentheses in e.