duplicates:

• SR-12132 @_exported does not respect custom operators

Issue Description:

Suppose you have a library with two targets: "Numerics" and "ReadModule". "Realmodule" has a public function named "realModuleTest". "Numerics" has a single file with the following line:

@_exported import RealModule

When you `import Numerics` into your project, you get access to "realModuleTest". This, as far as I understand, is the whole point of `@_exported import`.

However, when you define a custom operator inside of "RealModule", it does not get properly exported to "Numerics". Here is the custom operator I defined:

// RealModule/Real.swift

import Foundation

precedencegroup ExponentiativePrecedence {
  associativity: right
  higherThan: MultiplicationPrecedence
}

infix operator ** : ExponentiativePrecedence

public func ** (base: Double, power: Double) -> Double {
    return pow(base, power)
}

public func realModuleTest() {
    print("this function is defined in the real module")
}

I have uploaded this package to github: https://github.com/Peter-Schorn/OperatorAccessPackage

Please import the package into a command-line project and add the following to main.swift:

// main.swift
import Foundation
import Numerics

let x = 2.0
let y = 3.0

realModuleTest()  // works as expected

print(x ** y)  // error: "Operator is not a known binary operator"

You get the weird error described above. Surely this must be a bug, right?

UPDATE: I tried defining a custom infix and prefix operator and found that both were exported just fine. Therefore, this must be specific to infix operators.