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Once you've formatted your document you may `debug' it, i.e. browse through the errors (La)TeX reported.
Normally AUC TeX will only report real errors, but you may as well ask it to report `bad boxes' as well.
As default, AUC TeX will display that special `*help*' buffer containing the error reported by TeX along with the documentation. There is however an `expert' option, which allows you to display the real TeX output.
TeX-next-error
(C-c `).
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