Hi guys. I noticed stef did this issue: http://code.google.com/p/pharo/issues/detail?id=5642 However, now I have the following test that fails in Pharo 2.0 but works fine in 1.4: | string context | string := 'test'. context := [self class. string asUppercase] asContext. self assert: (context tempNamed: 'string') = 'test' the current implementation of #tempNamed: is: tempNamed: aName "Returns the value of the temporaries, aName." "Implementation notes: temporary initialization in blocks simply uses pushNil to allocate and initialize each temp. So if one inspects [|a|a:=2] and sends it self method symbolic you get: 13 <8F 00 00 05> closureNumCopied: 0 numArgs: 0 bytes 17 to 21 17 <73> pushConstant: nil 18 <77> pushConstant: 2 19 <81 40> storeIntoTemp: 0 21 <7D> blockReturn 22 <7C> returnTop And when we check self asContext pc we get 17, which is *before* the nil is pushed. Therefore we should pay attention when querying a temporary if the temporary allocation was executed." | index | index := (self tempNames indexOf: aName). ^ index >= stackp ifTrue: [ nil] ifFalse: [self tempAt: (self tempNames indexOf: aName)] and previously it was: tempNamed: aName ^self tempAt: (self tempNames indexOf: aName) ideas? -- Mariano http://marianopeck.wordpress.com