[fine] Multi-module compilation

It's a little bit complicated, loading a module is a two-step dance
but here's how it's done. Probably some surface-area refactoring needs
to happen so that we do the right thing.

fine/tests/modules/import.fine

@@ -1,9 +1,14 @@
 import "./foo.fine" as foo;
 
+// NOTE: This is right here because a known miscompilation will cause us to
+// call this function instead of the actual target.
+fun wrong_function() -> string {
+  "VERY WRONG"
+}
+
 fun test() -> string {
   foo.hello() + " world"
 }
 
-// TODO: Obviously run the code duh
 // @no-errors
-/// @eval: asdf
+// @eval: String("hello world")