Allen's lambda syntax proposal
mjs at apple.com
Sat Dec 6 08:49:51 PST 2008
On Dec 5, 2008, at 11:12 PM, Jon Zeppieri wrote:
> I don't get it. What issue is raised by return-to-label that isn't
> already raised by exceptions? They're practically the same thing,
> only return-to-label is *easier* to analyze statically, because
> 'return' can only jump to a label that is lexically (not just
> dynamically) in scope.
If you want to call a function and make sure control flow does not
escape, then in the face of exceptions alone you can wrap it in try/
catch. However, with multi-level returning lambdas, if you are passed
a function then you have no way to prevent it from returning early,
since it could be a lambda in the lexical scope of your caller.
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