return expr and if expr

[Doug Gwyn]

If one is serious about changing if & when syntax to remove ( ),
then something else must also be changed to indicate grouping.
The usual solution is something like
	if cond then stmt fi
where if, then, & fi are keywords.

Better yet is
	if cond then expr fi
so we can get rid of the ternary operator ? : .
Keep going, and you end up with a language that looks a lot like
Algol-68.