x is a
call, or an
object to be tested.
name is also known as ‘symbol’, from its type
typeof(x) == "language", then
is always true, but the reverse does not hold as expressions or
y also fulfill
is.language(y), see the examples.
This is a primitive function.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
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