WIP: cast prototype fn to correct type in prototype invocation

Author: dmiller

Clojure/Clojure/CljCompiler/Ast/InvokeExpr.cs

@@ -499,8 +499,10 @@ void EmitProto(RHC rhc, ObjExpr objx, GenContext context)
 
             objx.EmitVar(context,v);                              // var
             ilg.EmitCall(Compiler.Method_Var_getRawRoot);         // proto-fn
+            ilg.Emit(OpCodes.Castclass, typeof(IFn));
 
             ilg.Emit(OpCodes.Ldloc,targetTemp);                  // proto-fn, target
+
             EmitArgsAndCall(1,rhc,objx,context);
             ilg.Emit(OpCodes.Br,endLabel);