realLine combinator sometimes crashes the pp library #899
Description
I have been able to make show crash with a cycle detected when using the realLine() combinator extensively. Note that newlines in pp"" literals are interpreted as realLine(), even when this combinator isn't used directly.
Also note:
This is the stack trace that I obtained, for posterity:
(DN.789): While evaling inh 'silver:langutil:pp:inCHorizontals' in 'silver:langutil:pp:line' (5dd227b7)
(DN.775): While evaling inh 'silver:langutil:pp:inCHorizontals' via forward in 'silver:langutil:pp:cat' (4fbbd98c)
(DN.789): While evaling inh 'silver:langutil:pp:inCHorizontals' in 'silver:langutil:pp:nest' (39420d59)
(DN.789): While evaling inh 'silver:langutil:pp:inCHorizontals' in 'silver:langutil:pp:cat' (1331d6fd)
(silver.core.Ptail in Ptail.java:142): Error while evaluating function silver:core:tail
Cycle begins here:
(silver.core.Ptail in Ptail.java:142): Error while evaluating function silver:core:tail
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (182dcd2b)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (7ef7f414)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (49c4118b)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (5dc120ab)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (182fd26b)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.518): While evaling syn 'silver:langutil:pp:horizontals' via forward in 'silver:langutil:pp:nest' (238280df)
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (750c23a3)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (1c3b221f)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (2c92f094)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:group' (5bf1b528)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (1331d6fd)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.518): While evaling syn 'silver:langutil:pp:horizontals' via forward in 'silver:langutil:pp:nest' (39420d59)
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (4fbbd98c)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (3d3b852e)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (14ba7f15)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (55cb3b7)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (497fd334)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (6f89ad03)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (f287a4e)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:group' (71d2261e)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.518): While evaling syn 'silver:langutil:pp:horizontals' via forward in 'silver:langutil:pp:box' (53917c92)
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (1fa796a4)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (68de8522)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (73c09a98)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:cat' (6f2bf657)
(silver.core.PappendList in PappendList.java:154): Error while evaluating function silver:core:appendList
(DN.512): While evaling syn 'silver:langutil:pp:horizontals' in 'silver:langutil:pp:text' (27d6467)
(DN.425): While evaling local 'silver:langutil:pp:text:local:silver:langutil:pp:Document_sv:154:8:pr' in 'silver:langutil:pp:text' (27d6467)
(silver.langutil.pp.Pprune in Pprune.java:17): Error while evaluating function silver:langutil:pp:prune
(DN.512): While evaling syn 'silver:langutil:pp:outPosition' in 'silver:langutil:pp:text' (27d6467)
(DN.789): While evaling inh 'silver:langutil:pp:inPosition' in 'silver:langutil:pp:text' (27d6467)
(DN.789): While evaling inh 'silver:langutil:pp:inPosition' in 'silver:langutil:pp:cat' (6f2bf657)
(DN.789): While evaling inh 'silver:langutil:pp:inPosition' in 'silver:langutil:pp:cat' (73c09a98)
(DN.512): While evaling syn 'silver:langutil:pp:outPosition' in 'silver:langutil:pp:cat' (8dcacf1)
(DN.512): While evaling syn 'silver:langutil:pp:outPosition' in 'silver:langutil:pp:realLine' (50f13494)
(DN.789): While evaling inh 'silver:langutil:pp:indent' in 'silver:langutil:pp:realLine' (50f13494)
(DN.789): While evaling inh 'silver:langutil:pp:indent' in 'silver:langutil:pp:cat' (8dcacf1)
(DN.789): While evaling inh 'silver:langutil:pp:indent' in 'silver:langutil:pp:cat' (68de8522)
(DN.789): While evaling inh 'silver:langutil:pp:indent' in 'silver:langutil:pp:cat' (1fa796a4)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:box' (53917c92)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:group' (71d2261e)
(DN.512): While evaling syn 'silver:langutil:pp:outRemaining' in 'silver:langutil:pp:text' (3879feec)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:text' (3879feec)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:cat' (f287a4e)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:cat' (6f89ad03)
(DN.512): While evaling syn 'silver:langutil:pp:outRemaining' in 'silver:langutil:pp:text' (280c3dc0)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:text' (280c3dc0)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:cat' (497fd334)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:cat' (55cb3b7)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:cat' (14ba7f15)
(DN.789): While evaling inh 'silver:langutil:pp:inRemaining' in 'silver:langutil:pp:cat' (3d3b852e)
(DN.512): While evaling syn 'silver:langutil:pp:outRemaining' in 'silver:langutil:pp:line' (5dd227b7)
(DN.425): While evaling local 'silver:langutil:pp:line:local:silver:langutil:pp:Document_sv:198:8:horizontal' in 'silver:langutil:pp:line' (5dd227b7)
(silver.core.Phead in Phead.java:142): Error while evaluating function silver:core:head
(DN.789): While evaling inh 'silver:langutil:pp:inCHorizontals' in 'silver:langutil:pp:line' (5dd227b7)
(DN.775): While evaling inh 'silver:langutil:pp:inCHorizontals' via forward in 'silver:langutil:pp:cat' (4fbbd98c)
(DN.789): While evaling inh 'silver:langutil:pp:inCHorizontals' in 'silver:langutil:pp:nest' (39420d59)
(DN.789): While evaling inh 'silver:langutil:pp:inCHorizontals' in 'silver:langutil:pp:cat' (1331d6fd)
(silver.core.Ptail in Ptail.java:142): Error while evaluating function silver:core:tail
(T.52): Cycle detected in execution