Stream test result is invariant.

Additional Information

The 'IS ATTACHED' test on the STRING SOURCE 'X' is invariantly true; consider removing it.
    or
A stream type test on a VALUE STREAM argument is an invariant; consider removing it.
    or
The 'HAS NAME' test on a VALUE STREAM argument is an invariant; consider removing it.

Recovery

Compilation continues normally.

Explanation

The result of a stream test is known at compile time.

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