ada-mode: Comment Handling

 
 13 Comment Handling
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 By default, comment lines get indented like Ada code.  There are a few
 additional functions to handle comments:
 
 ‘M-;’
      Start a comment in default column.
 ‘M-j’
      Continue comment on next line.
 ‘C-c ;’
      Comment the selected region (add ‘--’ at the beginning of lines).
 ‘C-c :’
      Uncomment the selected region
 ‘M-q’
      autofill the current comment.