new sytnax for ops allows immediate defs
new sytnax for ops allows immediate defs

e.g.:

op foo  Nat = 3


git-svn-id: 9ecf60ce9baff443e30a0472d3fd222fcb8117cf@4168 7b97033b-253e-4a5c-9b07-e25f9089a9fd

KestrelInstitute/Specware,KestrelInstitute/Specware,KestrelInstitute/Specware,KestrelInstitute/Specware,KestrelInstitute/Specware