Set Bullet Behavior "Strict Subproofs".
Open Scope string_scope.
Section Jspec'_properties.
Variables
(CS : compspecs)
(ext_link : string -> ident)
(ext_link_inj : forall s1 s2, ext_link s1 = ext_link s2 -> s1 = s2).
Definition Jspec' := (@OK_spec (Concurrent_Espec unit CS ext_link)).

Lemma Jspec'_hered : ext_spec_stable age (JE_spec _ Jspec').