Enum case value must be literal: is there a macro that does literal expression evaluation and fill in the case value?

Using Swift
12

No, it should not be rejected. You're shadowing == with an unrelated static function that shares the same name, not changing the conformance of Double to Equatable. Swift doesn't offer you any way to make 0.0 equivalent to 1.0:

extension Double {
    static func == (lhs: Self, rhs: Self) -> Bool { true }
}
func areEqual<T: Equatable>(_ a: T, _ b: T) -> Bool { a == b }
areEqual(0.0, 1.0) // false
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