Files
mercury/extras/references/Mercury.options
Julien Fischer 105580a765 Delete the trseg component and --trail-segments option.
Trail segments have been the default in trailing grades since Mercury 20.06.
Delete the trseg grade components and --trail-segment option since apart from
acting as synonyms for the tr component and --use-trail option repsectively,
they no longer do anything.

compiler/compute_grade.m:
compiler/handle_options.m:
compiler/options.m:
doc/user_guide.texi:
grade_lib/grade_vars.m:
scripts/parse_grade_option.sh-subr:
grade_lib/grade_string.m:
grade_lib/grade_vars.m:
   Delete the trseg grade component and --trail-segments option.

compiler/add_pragma.m:
   Update the wording of an error message.

NEWS:
   Announce the above.

extras/trail/Mercury.options:
extras/trailed_update/Mmakefile:
extras/references/Mercury.options:
tests/invalid/test_feature_set.err_exp:
    Conform to the above changes
2022-04-05 17:02:40 +10:00

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#-----------------------------------------------------------------------------#
# Copyright (C) 2011 The University of Melbourne.
# Copyright (C) 2018, 2022 The Mercury team.
# This file is distributed under the terms specified in COPYING.LIB.
#-----------------------------------------------------------------------------#
MCFLAGS = --use-trail \
--use-grade-subdirs \
--libgrades-include-component tr \
--extra-library-header c_reference.h
MCFLAGS-global = --no-warn-nothing-exported --no-warn-interface-imports