if fr.Func != nil {
			// Use function-relative line numbering.
			// f:+2 means two lines into function f.
			// f:-1 should never happen, but be conservative.
			_, entryLine := fr.Func.FileLine(fr.Entry)
			loc = fmt.Sprintf("%s.%s:%+d", path, fname, fr.Line-entryLine)
		} else {
			// The function is non-Go code or is fully inlined:
			// use absolute line number within enclosing file.
			loc = fmt.Sprintf("%s.%s:=%d", path, fname, fr.Line)

	}
	return s.readSimpleExpecting(expectRE)
}

func (s *ioState) readExpecting(millis, interlineTimeout int, expectedRE string) tstring {
	timeout := time.Millisecond * time.Duration(millis)
	interline := time.Millisecond * time.Duration(interlineTimeout)
	s.last = tstring{}
	var re *regexp.Regexp
	if expectedRE != "" {
		re = regexp.MustCompile(expectedRE)
	}
loop:
	for {
		var timer <-chan time.Time