exit status: 1 with stderr:
<stdin>:11:5: error: '@usableFromInline' attribute can only be applied to internal declarations, but 'x' is public @usableFromInline ^~~~~~~~~~~~~~~~~ <stdin>:6:9: error: setter for 'x' is internal and cannot be referenced from an '@inlinable' function self.x = x ^ <stdin>:2:30: note: setter for 'x' is not '@usableFromInline' or public public internal(set) var x: Int ^ <stdin>:16:9: error: setter for 'x' is internal and cannot be referenced from an '@inlinable' function self.x = x ^ <stdin>:12:30: note: setter for 'x' is not '@usableFromInline' or public public internal(set) var x: Int ^