Okay,
Lets use your example with C/C++ comment styles. According to your beginning post you basically wanted to do this: /* /* */ */. To me, this is pointless. The /* */ comment is designed for debugging. Normal comments should be made with the //.
If you comment out a block with the /* */ and want to comment out a bigger block, don't add more of them, just move the ones you have. If the language doesn't have 2 kinds of comments, they typically only have the single line comment like REM. If you write formatted easy to follow code, you really shouldn't have any block /* */ comments in your finished code anyway, so you'd only need that if you write ugly programs in a straight line and actually want to comment them. Chances are if you purposely write ugly code, you don't want any comments. If you write a nested block comment, the program should reach out and smack you.