fix: fix repl autocomplete (#1225)
fix: fix repl autocomplete (#1225)

The recent Env refactor commits unwittingly broke the REPL's
autocompletion. This change restores the previous behavior.
carp-lang/Carp,eriksvedang/Carp,eriksvedang/Carp,carp-lang/Carp,carp-lang/Carp