id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
1400,:set +r doesn't work for interpreted modules,iampure@…,simonmar,"I expect 

{{{
a = trace ""a"" 1 
}}}

and then evaluating a repeatedly to show:
""a""
1

as a result. ghci seems to do this, but with larger programs this doesn't appear to happen. 

I guess it's an implementation detail in that expressions don't ""need"" to be evaluated twice, but for debugging purposes it's vital that it does. 

I want that the first run of an algorithm produces the same trace as any subsequent one. Especially when one uses the 6.7 debugger this is an issue. Essentially, I need to load another module first and then the module I am interested in and then set the breakpoints again. This is a UI nightmare. 

The option +r ""revert top-level expressions after each evaluation"" seems to indicate that should do what I want, but it doesn't.",bug,new,normal,_|_,GHCi,6.7,,,,Unknown/Multiple,Unknown/Multiple,None/Unknown,Moderate (less than a day),,,,