beta 2014.02.07 00:57

1 files changed, 5 insertions, 0 deletions

diff --git a/tex/context/base/core-env.lua b/tex/context/base/core-env.lua
index 8cbc93038..2cc84299b 100644
--- a/tex/context/base/core-env.lua
+++ b/tex/context/base/core-env.lua
@@ -31,6 +31,7 @@ tex.systemmodes         = allocate { }
 tex.constants           = allocate { }
 tex.conditionals        = allocate { }
 tex.ifs                 = allocate { }
+tex.isdefined           = allocate { }
 
 local modes             = { }
 local systemmodes       = { }
@@ -78,6 +79,10 @@ setmetatableindex(tex.ifs, function(t,k)
     return csname_id(k) ~= undefined and create(k)[2] == iftrue -- inefficient, this create, we need a helper
 end)
 
+setmetatableindex(tex.isdefined, function(t,k)
+    return csname_id(k) ~= undefined
+end)
+
 function context.setconditional(name,value)
     if value then
         context.settruevalue(name)