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Predeclared opaque types

The language predeclares the two types:

    TEXT  <: REFANY
    MUTEX <: ROOT
which represent text strings and mutual exclusion semaphores, respectively. These are opaque types. Their properties are specified in the required interfaces Text and Thread.

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Last modified on Tue Oct  3 17:19:03 PDT 1995 by heydon
     modified on Mon Apr 18 14:01:18 PDT 1994 by kalsow