Mention negative depth in syntax-ppss's output.
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@ -672,7 +672,8 @@ the parse:
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@enumerate 0
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@item
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The depth in parentheses, counting from 0.
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The depth in parentheses, counting from 0. Beware, it can
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become negative if there are more closing parens than opening ones.
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@item
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@cindex innermost containing parentheses
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