Segfault from evalq(return()) (PR#168)

[p.dalgaard@biostat.ku.dk]

Luke Tierney brought this up while we were discussing the semantics of
a possible let() or local() call:

> evalq(return())
Segmentation fault (core dumped)

This is not just caused by trying to pop an empty stack:

> f<-function(x)evalq(return())
> f(2)
Segmentation fault (core dumped)


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907

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