Improving brackets in Objective C syntax
The Objective C syntax is poisoned with nested square brackets:
[[[Class alloc] initWithApple:a andOrange:o] autorelease];
First, lets move opening bracket behind the name of the receiver:
Class[alloc][initWithApple:a andOrange:o][autorelease];
You may agree that this is much easier to write now. However, at this point we lose compatibility with ANSI C (think buffer[index]).
Lets omit brackets for messages without arguments and use a space as a delimiter:
Class alloc [initWithApple:a andOrange:o] autorelease;
At this point we may get back compatibility with ANSI C by making a non-context free grammar (parser should recognize that a[b:c] could not be used for index operations).
You can implement exactly that syntax in Io using the standard language features.