What version of Go are you using (go version)?

$ go version
go1.17.7

Does this issue reproduce with the latest release?

Yes.

What did you do?

I would like to programmatically access all fields of the arm64 disassembler Instruction Args.

	code := []byte{0x01,0xd4,0x43,0xf9} // LDR X1, [X0,#1960]
	inst, _ := arm64asm.Decode(code)
	fmt.Printf("opcode: %#v\n", inst)
	// arm64asm.Inst{Op:0xb1, Enc:0xf943d401,
	//	Args:arm64asm.Args{0x21, arm64asm.MemImmediate{Base:0x20, Mode:0x3, imm:1960},
	//	arm64asm.Arg(nil), arm64asm.Arg(nil), arm64asm.Arg(nil)}}

	// like to extract the offset
	arg := inst.Args[1].(arm64asm.MemImmediate)
	fmt.Printf("argument: %#v\n", arg)
	// arm64asm.MemImmediate{Base:0x20, Mode:0x3, imm:1960}
	//fmt.Printf("offset: %x\n", arg.imm) // error: "cannot refer to unexported field or method imm"

What did you expect to see?

To be able to access programmatically instruction arguments. This would be consistent with the other disassemblers: x86, arm32 and ppc. All of them have all Args field exported (or be typedef to a basic type). It seems arm64 is the only exception where some fields are not exported.

What did you see instead?

Build error, as several fields are unexported.