You can search for identifiers within the package.
in-package search v0.2.0
core
Core.Optional_syntax
Interfaces for use with the match%optional syntax, provided by ppx_optional.
match%optional
ppx_optional
module type S = Optional_syntax_intf.S
module type S1 = Optional_syntax_intf.S1
module type S2 = Optional_syntax_intf.S2