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From: Panicz Maciej Godek <godek.maciek@gmail.com>
Date: Thu, 24 Feb 2022 22:49:54 +0100
Message-ID: <CAMFYt2ayhZKYJG6LuZb6P8EGJfKVSOBBoRLTFM601qjQ8Cdu6g@mail.gmail.com>
Subject: Exception in thread "main" java.lang.InternalError: bad type SP:0
 st.l:1
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Hi,
I'm working on my code, and after some recent modificationsI get the
following error when I try to import my module:

Exception in thread "main" java.lang.InternalError: bad type SP:0 st.l:1
code:primitive.sequenceExtent(gnu.lists.Pair,Screen)Extent
        at gnu.bytecode.Label.setTypes(Label.java:106)
        at gnu.bytecode.Label.define(Label.java:231)
        at gnu.expr.LambdaExp.compileEnd(LambdaExp.java:640)
        at gnu.expr.LambdaExp.compileAsInlined(LambdaExp.java:1522)
        at gnu.expr.ApplyExp.compile(ApplyExp.java:378)
        ...
        at gnu.expr.ModuleExp.evalModule1(ModuleExp.java:246)
        at kawa.Shell.run(Shell.java:293)
        at kawa.Shell.run(Shell.java:183)
        at kawa.repl.processArgs(repl.java:724)
        at kawa.repl.main(repl.java:830)

How do I even approach debugging this?