Rename ftoken to scanUnit and session to generatorState

struct.go

@@ -349,10 +349,10 @@ func (p *valueProof) checkField(label string, ft reflect.Type, column node) erro
 }
 
 // fill draws the record into v's tagged fields, then each nested struct as a record of its own.
-func (s *structShape) fill(sess *session, v reflect.Value) {
+func (s *structShape) fill(state *generatorState, v reflect.Value) {
 	if s.record != nil {
 		var set holdSet
-		for i, c := range renderRecord(sess, s.record, s.columns, renderScope{set: &set}).columns {
+		for i, c := range renderRecord(state, s.record, s.columns, renderScope{set: &set}).columns {
 			setColumn(fieldAt(v, s.fieldIndexes[i]), c)
 		}
 	}
@@ -364,7 +364,7 @@ func (s *structShape) fill(sess *session, v reflect.Value) {
 			}
 			field = field.Elem()
 		}
-		n.shape.fill(sess, field)
+		n.shape.fill(state, field)
 	}
 }