2017-02-07 10:30 GMT+01:00 Denis Kudriashov <dionisiydk@gmail.com>:
More simple way to reproduce:

#(2) select: [:i| i]

Problem somehow related to mustBeBoolean error. If you try debug

#(2) select: [:i| i / 0]

Debugger will fallback into #/ method at ZeroDivide statement. But with mustBeBoolean trick it's not work.

I open issue��19662.

Also I found another funny issue. Try debugIt following expression:
1 ifTrue: [2].
You will be wondering that debugger will not able to open.