You can search for identifiers within the package.
in-package search v0.2.0
val error : Atd_ast.loc -> string -> 'a
val error2 : Atd_ast.loc -> string -> Atd_ast.loc -> string -> 'a
val error3 : Atd_ast.loc -> string -> Atd_ast.loc -> string -> Atd_ast.loc -> string -> 'a