<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="">Well… this on the other hand, compiles:<div class=""><br class=""></div><div class=""><div class="">-module(weird).</div><div class=""><b class="">-define(PLEASE_DONT, true).</b></div><div class="">-ifndef(PLEASE_DONT).</div><div class="">-compile({parse_transform,undefined_parse_transform}).</div><div class="">-endif.</div><div class=""><br class=""></div><div><blockquote type="cite" class=""><div class="">On Jan 30, 2017, at 12:24, <<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>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class="">Here’s a behaviour that’s had me tearing my hair today. Consider this
module:</div>
<div class=""> </div>
<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>
<div class=""> </div>
<div class="">It fails to compile, with one simple error message:</div>
<div class=""> </div>
<div class="">20> c('Aaargh!!').</div>
<div class="">Aaargh!!.erl: undefined parse transform 'undefined_parse_transform'</div>
<div class="">error</div>
<div class=""> </div>
<div class="">If you can see why, you’re more an Erlang wizard than I am!</div>
<div class=""> </div>
<div class="">John</div></div></div></div>
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