Summary: statement foreach semantic opApply should be tried if
range funcs not satisfied
Dsymbol *shead = search_function(ad, idhead);
if (!shead || !search_function(ad, idnext) || !search_function(ad,
only try to apply range semantic when all prerequisite func available.
This makes easier to port legacy code to d2. People won't try to figure why it
tries to call the func called empty/next which doesn't provided in my aggregate
however the func named head had been accidentally added.
This could block tango CircularList
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