[swift-evolution] [Pitch] Require "infix" for infix operator function declarations

[Jacob Bandes-Storch]

Currently, "infix" is not required/allowed on an operator function
definition, but "prefix" and "postfix" are:

    prefix operator ^^ {}   // valid
    postfix operator ^^ {}  // valid
    infix operator ^^ {}    // valid

    prefix func ^^(operand: Int) {}  // valid
    postfix func ^^(operand: Int) {} // valid
    infix func ^^(lhs: Int, rhs: Int) {}   // *error: *'infix' modifier is
not required or allowed on func declarations
    func ^^(lhs: Int, rhs: Int) {}         // valid

It seems like this was removed because it can be inferred from the number
of arguments (
https://github.com/apple/swift/commit/3ad9c58c18f0331444114e2eae3e772e702c326f).
But IMO the inconsistency from other operator function decls/defs is
jarring.

How does everyone feel about reinstating the "infix" modifier on functoins?
(It was removed before the open-source release and the advent of
swift-evolution, so I thought it'd be worth a public review.)

Jacob
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