Broken on latest master

[ViralBShah]

On Julia 4a1350090b79bd667745c65a3d87cbc0a222f385

julia> @enter gcd(5, 20)
ERROR: type Array has no field args
 in prepare_locals(::LambdaInfo, ::Array{Any,1}) at /Users/viral/.julia/v0.5/ASTInterpreter/src/ASTInterpreter.jl:862
 in enter_call_expr(::Void, ::Expr) at /Users/viral/.julia/v0.5/ASTInterpreter/src/ASTInterpreter.jl:907
 in eval(::Module, ::Any) at ./boot.jl:237

[Keno]

@JeffBezanson has a branch which needs to be merged.

[Keno]

Fixed.