db 0,\
1,\
\
3    

db 0,\
1,\
\/*  2,\ */
3    

Does not compile:

Code:

stdcall Something,value1,\ 
  value2,\
/*  value3,\ */
  value4
    

db 0,\ 
1,\ 
\x/*  2,\ */  <--- x = space
3
    

Does compile
============
-------------------------------------------ok
/* don't look here */
-------------------------------------------ok
/* xor eax,eax ;zero eax */
-------------------------------------------ok
db 0,\ 
1,\ 
\/*  2,\ */ <----- @revolution : without space now. (with or without)
3
-------------------------------------------ok
/*
    cmp     ebx,'/*'
*/
-------------------------------------------ok
stdcall MyProc ,eax,\  
ebx,\
/*  ecx,*/\    <- "\" is Mandatory. But with ";" and without "\" in the end,
edx                           it does not compile any more !

-------------------------------------------ok for all cases below

/*
comment
*/

    mov     eax, /* comment */ 'halt'

/* comment */   mov     eax , eax


stdcall /* comment */ MyProc, eax, ebx /*
comment */ , ecx, edx


MyProc /* comment */ : /* comment */ ret


struc array /* comment */ [arg] {
common
      match n def, /* comment */ arg \{
/* comment */ rept 1 %:1 \\{ /* comment */ . def  \\}
/* comment */ rept n-1 %:2 \\{ .\\#_/* comment 
                      */\\#% def \\}
 \}
/* comment */ }

very many possible variations!
and certainly more powerful than just ";"

=================================================================
this doesn't compile
====================

/*
        mov     eax,'*/' <--- difficult to solve this, possible, but more complex
/*
here : --> ; mov eax,'*/'
-------------------------------
/* mov bx,"*/"  */   <---- identical to previous case
here : --> ; mov bx,"*/"
-------------------------------
stdcall KeGetCurrentIrql,eax,\  
ebx,\
/*  ecx,*/       <---- PS : with "; ecx," it doesn't compile any more !!
edx              <--- but it's normal, "edx" is alone !!

PS: with /* ecx,*/\ ... it's ok !
-------------------------------
xor eax,eax ;zero eax /*
ignore me */ 
             doesn't compile, normal ...  
             ";" has priority over "/* */" !
             therefore, "ignore me */" is alone, 
             without the sign "/*" of the beginning. !!                 
-------------------------------
    

db /* 0    /**/
   */ 1    

db /* 0    /* */
   */ 1    

@SFeLi : Why don't you just use macros ?

/* comment */ opcode
or,
invoke myproc, eax /*comment*/,ebx

and a thousand other cases.
    

@revolution : doesn't compile.

db /* 0    /* */ 
   */ 1
it's normal and logical that this does not compile, "*/ 1" is alone.

I never said that nested comments are allowed.
nested comments ...
theoretical concept which has the only goal of trying
to reverse rotation of the earth 

this works
-----------

db /* 0    /*  
   */ 1

this also works
----------------

db /* 0    /* */1
    

db /*   /* */ */ /* /* */ */ */ /*/*/***/*/*/   */ 1  
    

Nested comments
----------------
everything below compiles without problem
------------------------------------------

       db 0,1,\/*comment  <-- ps: "\/*" (non-nested) == "\;"
 1,\ /*comment*/
    3  

     /*
          /*comment2*/comment1
        */

      /* don't look here */ ;'

      /* xor /*?*/eax,eax ;zero eax */

        mov     eax, /* comment - /*stop*/*/ 'halt'

   /* comment */   mov     eax , eax

       stdcall /* comment /* A/*B/*C*/D*/E*/ */ MyProc, eax, ebx /*
        comment */ , ecx, edx

   MyProc /* comment */ : /* /*C*/ comment */ ret

      stdcall KeGetCurrentIrql,eax,\
     ebx,\
      /*  ecx/*C/*not D*//*not E
  */*/,*/\
   edx

     /*
     cmp ebx,"/*" - cmp ecx,'/*' - '*/' but ?
   */

      /* comment *//* comment */

      mov   ecx,/*comment/*comment2*/*/'/*'
     mov   edx,'*/'

        dw/* 1 '/*' */'/*',/*null*/0

        mov /*a<-b/*not b<-a*/*/al,0/*but not/*al,'*/' */ok?*/ 

 mov     ecx,'/*'      /*
  movhlt  edx,"*/"      /* mov ecx,'/*' */*/

    

format PE GUI 4.0

include '%fasminc%/win32wx.inc'

.code

start:
        invoke  /***/ ExitProcess, 0


.end start    

format PE GUI 4.0

include '%fasminc%/win32wx.inc'

.code

start:
        invoke  /* **/ ExitProcess, 0


.end start    

format PE GUI 4.0

include '%fasminc%/win32wx.inc'

.code

start:
        invoke  /** */ ExitProcess, 0


.end start     

but now, it's time to eat here 12.30 hrs !