<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">It’s considered an unknown module attribute, and those aren’t errors.<br class=""><div><blockquote type="cite" class=""><div class="">30 янв. 2017 г., в 18:38, <a href="mailto:john.hughes@quviq.com" class="">john.hughes@quviq.com</a> написал(а):</div><br class="Apple-interchange-newline"><div class="">
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<div class="">So why isn’t that reported as an error?</div>
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<div class="">John</div>
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<div style="font-color: black" class=""><b class="">From:</b> <a title="alex0player@gmail.com" href="mailto:alex0player@gmail.com" class="">Alex S.</a> </div>
<div class=""><b class="">Sent:</b> Monday, January 30, 2017 4:31 PM</div>
<div class=""><b class="">To:</b> <a title="john.hughes@quviq.com" href="mailto:john.hughes@quviq.com" class="">john.hughes@quviq.com</a> </div>
<div class=""><b class="">Cc:</b> <a title="erlang-questions@erlang.org" href="mailto:erlang-questions@erlang.org" class="">erlang-questions@erlang.org</a> </div>
<div class=""><b class="">Subject:</b> Re: [erlang-questions] For your amusement--why doesn't this
compile?</div></div></div>
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<div class="">30 янв. 2017 г., в 18:24, <<a href="mailto:john.hughes@quviq.com" class="">john.hughes@quviq.com</a>> <<a href="mailto:john.hughes@quviq.com" class="">john.hughes@quviq.com</a>>
написал(а):</div>
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<div class="">Here’s a behaviour that’s had me tearing my hair today. Consider this
module:</div>
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<div class="">-module('Aaargh!!').</div>
<div class="">-define(PLEASE_DONT).</div>
<div class="">-ifndef(PLEASE_DONT).</div>
<div class="">-compile({parse_transform,undefined_parse_transform}).</div>
<div class="">-endif.</div>
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<div class="">It fails to compile, with one simple error message:</div>
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<div class="">20> c('Aaargh!!').</div>
<div class="">Aaargh!!.erl: undefined parse transform 'undefined_parse_transform'</div>
<div class="">error</div>
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<div class="">If you can see why, you’re more an Erlang wizard than I am!</div>
<div class=""> </div></div></div></div></div></blockquote>Easy enough, there’s no
one-argument define().</div>
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<div class="">Define it to true if you don’t care about the value.</div>
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