Everything Is References

Is there a language in which variables, function arguments, etc, are always references by default?

For example:

int x = 5;
int y = x;
y++;  // x and y are both 6

If you really did want a copy of something, you'd have to use a keyword:

int x = 5;
int y = copy(x);

And pass-by-value would also have to be done explicitly:

void func(int z)
{
   int w = copy(z); // now w is effectively "local"
}

It would force programmers to at least be aware of the fact that they're making a copy.

>>50
That's the way it normally works.  I guess it depends on your definition of "more appropriate."  As I stated from the beginning, I just think that making the "copy()" operation explicit would at least make new or bad programmers think for a second before passing that 50MB bitmap object into a function by value.