(m4.info.gz) Errprint

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 13.1 Printing error messages
 ============================
 
 You can print error messages using `errprint':
 
  -- Builtin: errprint (MESSAGE, ...)
      Prints MESSAGE and the rest of the arguments on the standard error
      output, separated by spaces.
 
      The expansion of `errprint' is void.  The macro `errprint' is
      recognized only with parameters.
 
      errprint(`Invalid arguments to forloop
      ')
      error-->Invalid arguments to forloop
      =>
 
    A trailing newline is _not_ printed automatically, so it must be
 supplied as part of the argument, as in the example.  BSD
 implementations of `m4' do append a trailing newline on each `errprint'
 call, while some other implementations only print the first argument.
 

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