More comprehensive recursion guard.#460

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jerith wants to merge 6 commits intotopazproject:masterfrom

jerith:jerith/better-recursion-guard

Commits on Mar 3, 2013

More comprehensive recursion guard.
jerith
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Commits on Mar 6, 2013

Use rstrs instead of symbols for recursion identifiers.
jerith
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Commits on Mar 7, 2013

Commits on Mar 17, 2013

Merge branch 'master' into jerith/better-recursion-guard
jerith
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