I have the same problem. It was stop all my work.<div><br></div><div><br><div class="gmail_quote">2011/4/26  <span dir="ltr">&lt;<a href="mailto:vagif.verdi@gmail.com">vagif.verdi@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

Completely fresh install of yesod 0.8<br>
I migrated my application successfully. It builds and works fine.<br>
<br>
But when trying yesod devel i get this error:<br>
<br>
yesod: panic! (the &#39;impossible&#39; happened)<br>
  (GHC version 7.0.2 for x86_64-unknown-linux):<br>
        System/Plugins.hs:(84,14)-(86,29): Non-exhaustive patterns in lambda<br>
<br>
<br>
Also cabal gives me following warning on configure:<br>
<br>
Warning: This package indirectly depends on multiple versions of the same<br>
package. This is highly likely to cause a compile failure.<br>
package haskell-src-meta-0.3 requires syb-0.2.2<br>
package aeson-0.3.2.4 requires syb-0.3<br>
<br>
Not sure if its related to the error in any way, but it does not affect the<br>
build, and my executable works fine.<br>
<br>
Cheers,<br>
Vagif Verdi<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Cheshkov Anton <br>Phone: +7 909 005 18 82<br>Skype: cheshkov_anton<br>
</div>