See
http://stackoverflow.com/questions/17129583/smalltalk-collection-is-empty-error-when-saving/17202938#17202938

This bug was found by a newbie on pharo 1.1, but it's still there in 4.5
trunk image

Try to decompile this (no matter in which class)

< aNumberWithUnits
    (self compareUnits: aNumberWithUnits)
        ifTrue: [self value: ((aNumberWithUnits value) < (self value)
ifTrue: [^true] ifFalse: [^false]).]
        ifFalse: [^Error new signal: 'Incompatible unit types.'].

Thanks to the newbie!
I would just have hated that!
Learning from one's own error is great, but from a dysfunctional system not
so :(
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