package core_kernel
Module Sexp_hidden_in_testSource
'a t is a type that uses Core.am_running_test to determine if it should use the 'a sexp serializer, or serialize the type as '<hidden_in_test>'. It can be thought of as a form of @sexp.opaque that is conditional upon if tests are running.
This type also derives sexp. This will not allow you to roundtrip values you create in tests and should be used carefully.