answer where a written type ends in one place

An arglist entry, an array's bound and its element type ask one
question, and disagreed: `(unsigned int)' was a name plus a type, a
trailing typedef a bound, a subscript the type's second word.

types.module.scm

@@ -18,5 +18,11 @@
      get-type-info
      get-tag-info
      get-fields
-     get-underlying-type)
+     get-underlying-type
+
+     type-head?
+     named-arg?
+     typedef-name?
+     array-bound?
+     array-element-type)
     "types.scm")