Forester_compiler.ExpandSourceTransform Code.trees into Syn.trees by folding over the import graph.
val initial_visible_trie :
(Forester_core.Syn.resolver_data, Forester_core.Range.t option)
Forester_core.Trie.tval expand_tree :
forest:State.t ->
Forester_core.Tree.code ->
Forester_core.Tree.syn
* Forester_core.Reporter.Message.t Asai.Diagnostic.t list