Comment #2 on issue 3763 by da...@teleport.com: assert failure during Decompiler>>popIntoTemporaryVariable: http://code.google.com/p/pharo/issues/detail?id=3763 I am running into this problem without having to load MetacelloBrowser .... The infinite loop is started when printString is sent to the MethodContext for the method MetacellMCVersionSpec resolveToLoadableSpecs:map: Here's the source for the method: resolveToLoadableSpecs: required map: packageMap | reqd allReqd map | reqd := required copy. allReqd := Set new. map := self packages map. [ reqd isEmpty ] whileFalse: [ | newReqd | newReqd := Set new. reqd do: [:req | (self resolveToLoadableSpec: req forMap: map packages: packageMap) do: [:loadableSpec | newReqd addAll: loadableSpec requires. newReqd addAll: loadableSpec includes ]]. allReqd addAll: reqd. newReqd removeAllFoundIn: allReqd. reqd := newReqd ]. packageMap keys do: [:pkgName | | spec | (spec := (packageMap at: pkgName) resolveToLoadableSpec) == nil ifTrue: [ packageMap removeKey: pkgName ] ifFalse: [ packageMap at: pkgName put: (packageMap at: pkgName) resolveToLoadableSpec ]] This particular bug is shutting me down so I will see if I can recast this method in a form that gets past method context printstring bug so I can figure out the root cause...