If in Pharo-1.4 I put a halt in a printOn: method (e.g. Interval>>#printOn: ) and then printIt Interval from: 0 to: 200 I get an endless loop of Halt Interval(Object)>>halt Interval>>printOn: Interval(Object)>>printStringLimitedTo: in Block: [:s | self printOn: s] String class(SequenceableCollection class)>>streamContents:limitedTo: Interval(Object)>>printStringLimitedTo: MethodContext>>printDetails: in Block: [receiver printStringLimitedTo: 90] BlockClosure>>on:do: BlockClosure>>ifError: MethodContext>>printDetails: MethodContext(ContextPart)>>errorReportOn: Halt Interval(Object)>>halt Interval>>printOn: Interval(Object)>>printStringLimitedTo: in Block: [:s | self printOn: s] String class(SequenceableCollection class)>>streamContents:limitedTo: Interval(Object)>>printStringLimitedTo: MethodContext>>printDetails: in Block: [receiver printStringLimitedTo: 90] BlockClosure>>on:do: BlockClosure>>ifError: MethodContext>>printDetails: MethodContext(ContextPart)>>errorReportOn: Halt Interval(Object)>>halt Interval>>printOn: Interval(Object)>>printStringLimitedTo: in Block: [:s | self printOn: s] String class(SequenceableCollection class)>>streamContents:limitedTo: Interval(Object)>>printStringLimitedTo: MethodContext>>printDetails: in Block: [receiver printStringLimitedTo: 90] BlockClosure>>on:do: BlockClosure>>ifError: MethodContext>>printDetails: MethodContext(ContextPart)>>errorReportOn: Is there a common way to debug printing statements? Thanks Paul