\input texinfo

@c this tests both the del comment and a file without
@c element.

 this is a comment.
#line 46 "a_file_after_del_comment"

@unknown

   this is a comment.
#line 106 "a_file_after_space_del_comment"

@unknown1

 a  this is a comment.
#line 206 "a_file_after_text_space_del_comment"

@unknown2

@bye