feat: figured out starmelon needs expr types

To generate partial application boxed closures I need to know the arity
of the expression to tell if more args will remain after the given args.
Right now I think I can recalculate the types if I have a symbol table
where I can look up every variable. I think this will be a lot of work
because I have to reimplement most of unification to deal with
collections, patterns, and type variables. And I currently don't know
how unification works.

Cargo.toml

@@ -12,7 +12,7 @@ edition = "2018"
 # it myself.
 [dependencies]
 ahash = "0.7"
-elmi = { path = "../../../infra/rust-elmi" }
+elmi = { path = "../../../infra/rust-elmi", features = [ "genco" ] }
 naive-wadler-prettier= { path = "../../../infra/redwood-lang/compiler/naive-wadler-prettier" }
 os_pipe = "0.9"
 serde = { version = "1.0", features = [ "derive" ] }
@@ -36,3 +36,4 @@ deno_web = "0.52"
 rusty_v8 = "0.32"
 futures = "0.3.15"
 serde_v8 = "0.15"
+