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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Inspired by <a href="http://www.erlang-factory.com/upload/presentations/347/Kostis.pdf" target="_blank">http://www.erlang-factory.com/upload/presentations/347/Kostis.pdf</a>, I decided to give Dialyzer a go. The first file I tried it on, however, failed with a rather unhelpful error. After trimming a few thousand lines, I’ve got it down to the following minimal case:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>-module(dialyzer_test).<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>-export([test/1]).<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>-record(rec1, {f1}).<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>-record(rec2, {f2}).<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>-type rec1(T) :: #rec1{f1 :: T}.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>-type rec2(T) :: #rec2{f2 :: T}.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>-spec test(rec2(rec1(A))) -> A.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>test(#rec2{f2 = #rec1{f1 = X}}) -> X.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The Dialyzer error is:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-family:Consolas'>dialyzer: Analysis failed with error: Illegal declaration of #rec2{f2}<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can anyone explain to me what’s wrong with my types and spec? Please advise. Thank-you.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>David Mercer<o:p></o:p></p></div></body></html>