26.2 Translation

ISO Standard: “How a diagnostic is identified (3.10, 5.1.1.3).”
Implementation: All output to stderr is a diagnostic.
ISO Standard: “Whether each nonempty sequence of white-space characters other than new-line is retained or replaced by one space character in translation phase 3 (5.1.1.2).”
Implementation: Each sequence of whitespace is replaced by a single character.