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This changes struct frame_arg to be self-managing and then fixes the various users. Tested by the buildbot. gdb/ChangeLog 2019-08-07 Tom Tromey <tromey@adacore.com> * stack.c (print_frame_arg, read_frame_local, read_frame_arg) (print_frame_args): Update. * python/py-framefilter.c (py_print_single_arg, enumerate_args): Update. * mi/mi-cmd-stack.c (list_arg_or_local): Update. * frame.h (struct frame_arg): Add initializers. <error>: Now a unique_xmalloc_ptr.