Oh right Linux

Author: grynspan

Sources/Testing/Attachments/Images/ImageAttachmentError.swift

@@ -10,6 +10,8 @@
 
 #if os(Windows)
 package import _TestingInternals // for HRESULT
+#else
+private import _TestingInternals
 #endif
 
 /// A type representing an error that can occur when attaching an image.