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Paul Eggert authored
clang has undefined behavior if the program subtracts an integer from (char *) 0. Problem reported by YAMAMOTO Mitsuharu in: http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00132.html * lisp.h (lisp_h_XUNTAG) [USE_LSB_TAG]: (XUNTAG) [!USE_LSB_TAG]: Port to clang 3.5.0.
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