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Estimated hours taken: 2 Branches: main Add a new grade component, .decldebug. It is as proposed on mercury-developers, minus the implications about I/O tabling. Those will come later. compiler/options.m: Add a new option, --decl-debug, that switches on declarative debugging. compiler/trace_params.m: The procedure that converts strings representing trace levels to trace levels themselves now has an extra argument, which gives the value of the --decl-debug option. If set, it raises the minimum trace level, and turn explicitly specifying trace levels `shallow' and `deep' into errors (since they are not sufficient for declarative debugging). compiler/handle_options.m: Pass the value of the --decl-debug option to trace_params, and handle the errors that may result. Handle the implications of --decl-debug and the .decldebug grade component. compiler/compile_target_code.m: Define MR_DECL_DEBUG when invoking the C compiler if --decl-debug is set. runtime/mercury_conf_param.h: Document MR_DECL_DEBUG, which is defined iff the grade is a .decldebug grade. runtime/mercury_grade.h: Take MR_DECL_DEBUG into account when computing the grade component related to debugging. Update the list of places that need to be modified when adding new grade components. doc/user_guide.texi: Document --decl-debug and the .decldebug grade component. Document the events used by declarative debugging, since Mark didn't. Fix some minor unrelated omissions. scripts/init_grade.sh-subr: scripts/parse_grade_options.sh-subr: scripts/final_grade.sh-subr: scripts/canonical_grade.sh-subr: scripts/mgnuc.in: scripts/ml.in: Add a new shell variable, decl_debug, to represent the value of MR_DECL_DEBUG, and handle it as appropriate. tests/debugger/Mmakefile: Do not execute shallow traced tests in .decldebug grades, since we don't support shallow tracing in such grades. Specify --trace decl instead of --trace deep in .decldebug grades when compiling the other tests, since we don't support --trace deep in .decldebug grades.