add support for unexposed type definitions

desperately need tests.

lib/generateffi.js

@@ -163,8 +163,20 @@ exports.generate = function (opts) {
           } else if (this.kind == Cursor.FieldDecl && this.type.kind == Type.Unexposed) {
             //console.error('FieldDecl', this.type.kind, this.type.spelling);
             t = wrap.elements[wrap.elements.length - 1];
-            t.name = this.spelling;
-            return Cursor.Continue;
+            /* This may not be entirely correct, we're assuming that because we
+             * already have elements defined that we're at the name of it,
+             * consider `union { int foo; } myUnion;` but it's also possible
+             * we are at an actual definition and we should be defining this type
+             *
+             * TODO -- man I need tests.
+             */
+            if (t) {
+              t.name = this.spelling;
+              return Cursor.Continue;
+            } else {
+              t = defineType(this.type.declaration);
+              tname = this.spelling;
+            }
           } else {
             t = mapType(this.type, this.spelling);
             tname = this.spelling;