You can search for identifiers within the package.
in-package search v0.2.0
type t = Migrate_parsetree.Ast_404.Parsetree.expression
val const_of_int : int -> Migrate_parsetree__Ast_404.Parsetree.expression
val spliced : Segment.t -> Migrate_parsetree.Ast_404.Parsetree.core_type -> Migrate_parsetree.Ast_404.Parsetree.expression