Return error from at-doc if macroexpand fails.
#13908
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When `macroexpand` fails due to an undefined macro in the expression return the resulting error rather than the more generic and misleading "invalid doc expression..." error message. Fixes JuliaLang#13905.
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Return error from `at-doc` if `macroexpand` fails.
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When
macroexpandfails due to an undefined macro in the expression return the resulting error rather than the more generic and misleading "invalid doc expression..." error message.Fixes #13905.