exit status: 1 with stderr:

<stdin>:49:63: error: generic parameter 'T' could not be inferred public static let default2 = SymbolFormatter.defaultStyle ∘ Demangler.default <stdin>:22:24: note: in call to operator '∘' public static func ∘ <A, B, C>(_ lhs: Converter<B, C>, _ rhs: Converter<A, B>) -> Converter<A, C> {

(edited)