check for any type
No valid maple expression is of this type. That is, this type always returns false.
Expression sequences cannot be allowed, because each element would be interpreted as a separate argument to type.
Note that one use of this type is for a local variable declaration in a procedure, and indicates that the local is to be used as-is (e.g. in an internally constructed polynomial, or as a temporary placeholder), and will not be assigned. This is helpful to avoid mint warnings for variables that are used but not assigned.
The following procedure computes a binomial coefficient and requires x be declared of type nothing to avoid a mint warning for use of an unassigned variable:
f := proc(n::posint, i::nonnegint) local pol, x::nothing; pol := expand((x+1)^n); return coeff(pol,x,i); end proc:
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