You can search for identifiers within the package.
in-package search v0.2.0
ppxlib.ast
Ppxlib_ast.Location_error
type t
val of_exn : exn -> t option
val register_error_of_exn : (exn -> t option) -> unit
val message : t -> string
val set_message : t -> string -> t
val make : loc:Warnings.loc -> string -> sub:(Warnings.loc * string) list -> t
val to_extension : t -> Migrate_parsetree.Ast_411.Parsetree.extension