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undefine
Combined from primary sources listed below.

In Independent routines§

See primary documentation in context for sub undefine. 

multi undefine(Mu    \x)
multi undefine(Array \x)
multi undefine(Hash  \x)

DEPRECATED in 6.d language version and will be removed in 6.e. For Array and Hash, it will become equivalent to assigning Empty; for everything else, equivalent to assigning Nil or Empty in the case of arrays or hashes, whose use is advised.