Return type: Switch
Returns:       Returns true if the stream is attached to a referent and false otherwise. Replacing is with isnt will reverse the results.

Syntax

stream-name  indexer? (is | isnt) referent

Tests whether the specified stream is attached to a referent.

Note that if a stream is bound to a previously defined referent and then discarded, that referent still exists, but is no longer attached.

Related Syntax referents is attached

[ INDEX ] [ CONCEPTS ] [ TASKS ] [ SYNTAX ] [ LIBRARIES ] [ LEGACY LIBRARIES ] [ ERRORS ]