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PR c++/84449 * tree.c (bot_manip): If build_cplus_new or break_out_target_exprs returns error_mark_node, return it immediately. (break_out_target_exprs): If cp_walk_tree with bot_manip returns error_mark_node, return error_mark_node. * g++.dg/cpp0x/constexpr-84449.C: New test. From-SVN: r257839
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