is_vartype : type -> bool

SYNOPSIS
Tests a type to see if it is a type variable.

FAILURE
Never fails.

EXAMPLE
- is_vartype Type.alpha;
> val it = true : bool

- is_vartype bool;
> val it = false : bool

- is_vartype (Type `:'a  -> bool`);
> val it = false : bool

SEEALSO  mk_vartype,   dest_vartype

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