if r < utf8.RuneSelf {
		return r == '-' || r == '.' || r == '_' || r == '~' ||
			'0' <= r && r <= '9' ||
			'A' <= r && r <= 'Z' ||
			'a' <= r && r <= 'z'
	}
	return false
}

func escapedImportPathOK(r rune) bool {
	return modPathOK(r) || r == '+' || r == '/' || r == '%'
}

// splitPkg splits the full linker symbol name into package and local symbol
// name.