4.6 Trailing whitespace

• There MUST NOT be any whitespace at the end of a line.

  Rationale: although this whitespace is usually not visible, it clobbers source code with useless bytes.

• While it is not a requirement, contiguous whitespace MAY be merged with tabulation marks, assuming 8-space wide tabulations.
• (Reminder, see File layout) The DOS CR+LF line terminator MUST NOT be used. Hint: do not use DOS or Windows text editors.