Merge pull request #1156 from stan-dev/pairs-evaluation

pairs.R: evaluate in parent.frame() (maybe)

Author: andrjohns

Diff for: rstan/rstan/R/pairs.R

@@ -204,5 +204,5 @@ pairs.stanfit <-
     mc$condition <- NULL
     mc$pars <- NULL
     mc$include <- NULL
-    eval(mc)
+    eval(mc, parent.frame())
   }