func isQuote(r rune) bool {
	return r == '"'
}
isQuote reports whether r is a quote
package lexic
import (
	"fmt"
	"os"
	"unicode"
)
func checkErr(err error) {
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}
func isKeyword(w string) bool {
	for _, kw := range kwList {
		if kw == w {
			return true
		}
	}
	return false
}
func isColon(r rune) bool {
	return r == ':'
}
func isSlash(r rune) bool {
	return r == '/'
}
func isBackSlash(r rune) bool {
	return r == '\\'
}
func isDollar(r rune) bool {
	return r == '$'
}