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This patch preserves the source locations of each node in a member initializer list so that during processing of the list we can set input_location appropriately for generally more accurate diagnostic locations. Since TREE_LIST nodes are tcc_exceptional, they can't have source locations, so we instead store the location in a dummy tcc_expression node within the TREE_TYPE of the list node. gcc/cp/ChangeLog: PR c++/94024 * init.c (sort_mem_initializers): Preserve TREE_TYPE of the member initializer list node. (emit_mem_initializers): Set input_location when performing each member initialization. * parser.c (cp_parser_mem_initializer): Attach the source location of this initializer to a dummy EMPTY_CLASS_EXPR within the TREE_TYPE of the list node. * pt.c (tsubst_initializer_list): Preserve TREE_TYPE of the member initializer list node. gcc/testsuite/ChangeLog: PR c++/94024 * g++.dg/diagnostic/mem-init1.C: New test.
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