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the sequencing! Making it an inline function broke the tests.
But we can't have multiple evaluation either, so it's going to use
a temporary lexical variable.
(uses_or2): Macro which declares the lexical variable needed by or2.
* debug.c (debug): add uses_or2.
* eval.c (eval_intrinsic, op_modplace): Likewise.
* lib.c (lazy_str, lazy_str_force_upto, lazy_str_get_trailing_list):
Likewise.
* match.c (h_parallel, v_freeform, v_parallel, v_output): Likewise.
* parser.y (unquotes_occur): Likewise.
* stream.c (format): Likewise.
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Implemented better way of printing character context.
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* Makefile (OBJS): New object file debug.o.
* dep.mk: Updated.
* match.c (h_fun): Use debug_begin and debug_end macros
to set up a debug frame for backtracing.
(match_line, match_files): Call debug_check to give debugger a chance
to instrument call.
(v_fun): Use debug_begin and debug_end macros to set up a debug frame
for backtracing. Call debug_check to give debugger a chance to
instrument call.
* stream.c (struct strm_ops): New function pointer, flush.
(stdio_maybe_write_error): Wrong word in error message corrected.
(stdio_flush): New static function.
(stdio_ops, pipe_ops): New function entered into tables.
(flush_stream): New function.
* stream.h (flush_stream): Declared.
* txr.c (help): New options documented.
(main): call to debug_init added. New debug options parsed and
opt_debugger set accordingly.
* unwind.c (uw_push_debug, uw_current_frame): New function.
* unwind.h (uw_frtype): New enumeration member UW_DBG.
(struct uw_debug): New frame variant.
(union uw_frame): New member, db.
(uw_push_debug, uw_current_frame): Declared,
* debug.c: New file.
* debug.h: New file.
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