YAAO (yet another assignment operator)

[Lars Pensj|]

x
I like the idea of a assignment operator in the form

	X <binop>= Y;

(but I am not sure i want it implemented in the language C).

Some operators will be redundant, like ',='. I also question
the usefulness of '.='.

I can see two purposes of this <binop>= operator:

1.	More dense, compact or readable programs.

2.	Make more efficient programs when the compiler isn't smart enough
	to see this himself.

Point 1 can be somewhat satisfied using the preprocessor.
In this case, I am more interested in point 2. Why not expand this
to the more general case where

	X = ... X ...;

can be rewritten to an expression where the address of X only needs to
be calculated once. The syntax for this could be

	let X = expr in ... X ...;

for example

	let x = a[j*10+i] in x = func(x);

This example shows a case where the compiler could not do this optimization
if 'j' or 'i' was global variables. Another syntactic form could be

	X = expr @ ... X ...;

This construction already exists in some languages.