id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
2404,GHCi :r does not reset imported class instances,MartijnVanSteenbergen,,"Have a module contain:

{{{
import Control.Monad.Error ()

fromError :: Either String a -> a
fromError = either error id

boom = fromError (return 'x')
}}}

and load in it GHCi. Remove the first line (import ...) and reload. GHCi compiles happily, but then evaluating boom gives:

During interactive linking, GHCi couldn't find the following symbol:
  mtlzm1zi1zi0zi0_ControlziMonadziErrorziClass_zdf2_closure

GHCi should instead produce a compiler error on reloading.",bug,closed,normal,,Compiler,6.8.2,duplicate,,,MacOS X,x86,,Unknown,,,,