continue
			}
			if got.lit != "newline" {
				t.Errorf("%s: got %s; want newline", src, got.lit)
			}
		}

		got.next()
	}

	if got.tok != _EOF {
		t.Errorf("got %q; want _EOF", got.tok)
	}
}

var sampleTokens = [...]struct {
	tok  token
	src  string
	op   Operator
	prec int
}{
	// name samples
	{_Name, "x", 0, 0},
	{_Name, "X123", 0, 0},

type tokenKind int

const (
	_EOF tokenKind = -(iota + 1)
	_EOLCOMMENT
	_IDENT
	_STRING
	_COMMENT

	// newlines and punctuation tokens are allowed as ASCII codes.
)

func (k tokenKind) isComment() bool {
	return k == _COMMENT || k == _EOLCOMMENT
}

// isEOL returns whether a token terminates a line.
func (k tokenKind) isEOL() bool {
	return k == _EOF || k == _EOLCOMMENT || k == '\n'
}

		linebreaks: form == 0,
	}

	defer func() {
		n = p.written
		if e := recover(); e != nil {
			err = e.(writeError).err // re-panics if it's not a writeError
		}
	}()

	p.print(x)
	p.flush(_EOF)

	return
}

// String is a convenience function that prints n in ShortForm
// and returns the printed string.
func String(n Node) string {
	var buf strings.Builder
	_, err := Fprint(&buf, n, ShortForm)

		s.nextch()
		s.ident()
		return
	}

	switch s.ch {
	case -1:
		if nlsemi {
			s.lit = "EOF"
			s.tok = _Semi
			break
		}
		s.tok = _EOF

	case '\n':
		s.nextch()
		s.lit = "newline"
		s.tok = _Semi

	case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
		s.number(false)

	case '"':
		s.stdString()

	case '`':