Strange things allowed in iasm

[Basile B. via Digitalmars-d-learn]

1/

void foo()
{
    asm pure nothrow
    {
        naked;
        mov RAX, [0x10][0x20] R8;
        ret;
    }
}

generates

;------- SUB 0000000000449468h -------
0000000000449468h  mov eax, 00000030h
000000000044946Dh  ret
;-------------------------------------


2/

void foo()
{
    asm pure nothrow
    {
        naked;
        mov RAX, [R9][R10] R8;
        ret;
    }
}

generates

;------- SUB 0000000000449468h -------
0000000000449468h  mov rax, r8
000000000044946Bh  ret
;-------------------------------------


IASM Parser bug ?