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<p class="MsoNormal"><span style="font-size:11.0pt">Hi ghc-devs,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I’m currently writing a core plugin that I could use some help with.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Consider the following two modules:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">```<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">module A where<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">foo :: Int<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">bar :: Int<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">module B where<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">baz :: Int<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">baz = bar<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">```<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">When compiling module B I run my plugin. The goal of the plugin is to replace the occurrence of `bar` with `foo`. Note that we can be sure that `foo` is actually imported, but unfortunately doesn’t occur anywhere
in B before the plugin performs the transformation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The problem I have is that in order to inject `foo` in B I need to have an `Id` which represents `foo` and I’m having some trouble constructing such an `Id`. I’ve looked through the various environments that
are available during the core to core transformations but none of them provides enough information to actually produce the `foo` `Id` as far as I can see. I hope I’m missing something. What do I need to do in order to construct the `foo` `Id` in module B?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Josef<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">PS. The way I’ve phrased my problem in this email it would be possible to solve it with rewrite rules. My actual use case is unfortunately more complicated and rewrite rules don’t provide enough power to do
what I want.<o:p></o:p></span></p>
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