[erlang-questions] For your amusement--why doesn't this compile?

john.hughes <>
Mon Jan 30 16:38:57 CET 2017


So why isn’t that reported as an error?

John

From: Alex S. 
Sent: Monday, January 30, 2017 4:31 PM
To:  
Cc:  
Subject: Re: [erlang-questions] For your amusement--why doesn't this compile?


  30 янв. 2017 г., в 18:24, <> <> написал(а):

  Here’s a behaviour that’s had me tearing my hair today. Consider this module:

  -module('Aaargh!!').
  -define(PLEASE_DONT).
  -ifndef(PLEASE_DONT).
  -compile({parse_transform,undefined_parse_transform}).
  -endif.

  It fails to compile, with one simple error message:

  20> c('Aaargh!!').
  Aaargh!!.erl: undefined parse transform 'undefined_parse_transform'
  error

  If you can see why, you’re more an Erlang wizard than I am!

Easy enough, there’s no one-argument define().

Define it to true if you don’t care about the value.
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