fix isdefined depwarn

ChrisRackauckas · ChrisRackauckas · commit 4771938f93e6 · 2018-07-13T18:11:23.000-07:00
diff --git a/src/ParameterizedFunctions.jl b/src/ParameterizedFunctions.jl
@@ -10,7 +10,7 @@ module ParameterizedFunctions
 
   using SymEngine
 
-  if isdefined(:pre_env_value)
+  if @isdefined pre_env_value
     ENV["symengine_jl_safe_failure"] = pre_env_value
   else
     delete!(ENV,"symengine_jl_safe_failure")
