Hi Denis, (Hi Michaels, this may be related yo your issue)... Denis, this is nothing to do with blocks having homes. It's somewhere in the simulation of RemoteString>>text (used in CompiledMethod>>getSourceFromFile), specifically when UTF8TestDecoders egt involved. Try the following and you'll see the -261 doesNotUnderstand: which is the symptom of the broken simulation. Don't know exactly where simulation breaks down (but I suspect primitive invocation). Anyway this may get you started digging deeper. | m | m := ClassWithBlockDecompilation >> #methodWithDecompilation. ContextPart trace: [ m getSourceFromFile ] "fails" | m | m := ClassWithBlockDecompilation >> #methodWithDecompilation. m getSourceFromFile "succeeds" To dig deeper you may want to open up ContextPart class>>trace:on: in a workspace and put in some break-points, e.g. the following halts at the first doesNotUnderstand:. Work your way back from there to find out where the -261 is coming form (I'm using Squeak 4.1, YMMV). | aStream m aBlock prev | (aStream := Transcript) clear. m := ClassWithBlockDecompilation >> #methodWithDecompilation. aBlock := [m getSourceFromFile]. prev := aBlock. ^thisContext sender runSimulated: aBlock contextAtEachStep: [:current | current selector = #doesNotUnderstand: ifTrue: [self halt]. Sensor anyButtonPressed ifTrue: [^ nil]. current == prev ifFalse: [prev sender ifNil: [aStream space; nextPut: $^. ContextPart carefullyPrint: current top on: aStream]. aStream cr. (current depthBelow: aBlock) timesRepeat: [aStream space]. ContextPart carefullyPrint: current receiver on: aStream. aStream space; nextPutAll: current selector; flush. prev := current] HTH Eliot 2010/5/22 Denis Kudriashov <dionisiydk@gmail.com>

Block decompilation not work at situation during code simulation. Maybe its just problem in debugger "Through button" action implementation. This happen because block home in that situation not exists.

I attach class ClassWithBlockDecompilation which help reproduce that manually. See class side method #debug

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