You're close! The misunderstanding seems to be that your are expecting that instantiating the module will modifiy the top level REPL environment. This is not the case and it would be kinda scary if it did that. Wasm modules are their own separate, isolated things. If you want a reference to the make-text-node procedure then you should return it by referencing it in the final line of the program you're compiling with Hoot. From there, run hoot-load on the instantiated module and if you've done everything correctly, the result will be a reference to the make-text-node procedure. The tutorial in the manual goes through this process in more detail.