check that all values are defined

Author: rdeits

src/subs.jl

@@ -8,6 +8,7 @@ function evalmap{T}(vars, x::Vector{T}, varorder::Vector{PolyVar})
       vals[j] = x[i]
     end
   end
+  @assert all(i -> isdefined(vals, i), 1:length(vals))
   vals
 end