Language Ideas

do you guys ever have ideas for features in programming languages that you have never seen implemented but would like to?
i'm sure some of you have. i can't be the only one.
share them here.
i'll start with an idea i had a little while ago; i wouldn't be surprised if some language such as perl had already thought of it though.

have you ever been stuck writing long if statements along the lines of: if(c == x || c == y || c == z)?
sure, it might not look so bad in this case since it's rather short. but what if you could abbreviate it?
something like: if(c == ||(x,y,z)), or perhaps if(c == (x || y || z)), or even if((x,y,z)||==(a,b,c)), which would expand to if(x == a || y == b || z == c).
wouldn't that be a nice little time saver?

>>27
I expect C to be C, a portable assembler where you can (mostly) predict the performance of your program.
There are high-level languages which support meta-programming(and of those that I can think of (Lisp and SEPPLES), both have implementation-dependent ways which support low-level stuff when needed), but that's their purpose, it's not C's purpose.