It's possible to implement synchronous closures without instances, and to make non-local returns in closures not subject to unchecked exceptions. This article explains why. I like using Google Docs as a word processor, but the last time I published to blogger automatically from it, I lost some formatting, and even a random backslash, so this time I'm not going to bother. The actual article is here. Comment on this blog.
CodeSOD: Trim the Tree
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