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The loop keywords
designate constructs that use a single test condition to determine when loop iteration should terminate.
The constructs
provide specific values to be returned when a loop terminates. Using these with value-returning accumulation clauses can produce unpredictable results.
In all other respects these constructs behave like the
constructs.
The macro loop-finish can be used at any time to cause normal termination.
In normal termination, ‘finally’ clauses are executed and default return values
are returned.
‘End-test’ control constructs can be used anywhere within the loop body. The termination conditions are tested in the order in which they appear.