Make ExpressibleByStringLiteral tolerable

StringLiteral.swift

// If you want types initializable from String literals
// but don't want to implement three separate initializers.


extension ExpressibleByUnicodeScalarLiteral where Self: ExpressibleByStringLiteral, Self.StringLiteralType == String {
    public init(unicodeScalarLiteral value: String) {
        self.init(stringLiteral: value)
    }
}

extension ExpressibleByExtendedGraphemeClusterLiteral where Self: ExpressibleByStringLiteral, Self.StringLiteralType == String {
    public init(extendedGraphemeClusterLiteral value: String) {
        self.init(stringLiteral: value)
    }
}