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

[Brujo Benavides]

Well… this on the other hand, compiles:

-module(weird).
-define(PLEASE_DONT, true).
-ifndef(PLEASE_DONT).
-compile({parse_transform,undefined_parse_transform}).
-endif.

> On Jan 30, 2017, at 12:24, <john.hughes@REDACTED> <john.hughes@REDACTED> wrote:
> 
> 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!
>  
> John
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