term.go: added two new priorities (priIterValue and priPrePost); new function term.symbol())

term.go

@@ -23,7 +23,9 @@ const (
 	priSelector
 	priSign
 	priFact
+	priIterValue
 	priCoalesce
+	priPrePost
 	priDot
 	priValue
 )
@@ -127,6 +129,10 @@ func (self *term) setParent(parent *term) {
 	}
 }
 
+func (self *term) symbol() Symbol {
+	return self.tk.Sym
+}
+
 func (self *term) source() string {
 	return self.tk.source
 }