easy-when-binds-return

People often try to use return inside when blocks. Currently, this just 
produces confusing "Ejector must be enabled" errors.

How about requiring the use of "return" to return a value from a when block?

There are a few places where this would be useful:

- Often you will move a whole block in to or out of a when() block. It's 
useful if you don't have to change all return lines when you do this.

- People sometimes don't notice that the value of the last expression is 
used, and put something after it.

e.g. they change

return when (foo) -> {
	foo.invoke()
}

to

return when (foo) -> {
	foo.invoke()
	traceln("here")
}

and then wonder why they're getting null pointer exceptions elsewhere.

- You can accidentally return a value, when all you intended was to tell 
the caller when you were done.


Patch to add #pragma.enable("easy-when-binds-return"):

http://gitorious.org/~tal-itinnov/repo-roscidus/it-innovation/commit/c10e7bc99bbfbabbbb28ea714e19855fbca8c389


-- 
Dr Thomas Leonard
IT Innovation Centre
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Southampton SO16 7NS, UK


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