* doc/misc/reftex.texi (Builtin Label Environments):
* lisp/textmodes/reftex-vars.el (reftex-label-alist-builtin)
(reftex-default-label-alist-entries): Delete entries for the
supertabular environment. supertabular is an extension of the
normal tabular environment, and therefore doesn't contain a
caption and label. Hence, supporting supertabular in RefTeX is
useless.
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