trace

type Closer interface {
	Close() error
}

type NullLogger struct{}

type Printer interface {
	// Print formats using the default formats for its operands and writes to specific output.
	Print(v ...interface{})
	// Printf formats according to a format specifier and writes to specific output.
	Printf(format string, v ...interface{})
	// Println formats using the default formats for its operands and writes to specific output.
	Println(v ...interface{})
}

type PrinterCloser interface {
	Printer
	Closer
}