disallow if without else
v0.1
delete for loop
allow input string
maybe OK
intern_dcl
func_decl
single line comment only
modified according to new specification
modified according to new specification
rename C-- input file
adjust to new input file name
change the way to compute ppt
remove unused precedence
fix a bug in Rules#first
remove for
modify to fit the new grammar
fix a bug in cmm.bnf.txt : missing ID
no loop in cmm_yacc.py when proccessing input file
terminal definition ambiguious