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When set, this option tells the compiler to generate warnings
about locally-defined types that are neither used in the module
nor exported to any other module.
compiler/options.m:
Add the new option.
compiler/unused_types.m:
New module to implement the new option.
compiler/mercury_compile_front_end.m:
Invoke the new module, unless the presence of previous errors
would make its warnings just a distraction.
compiler/check_hlds.m:
Include the new module.
compiler/notes/compiler_design.html:
Document the new module.
compiler/typecheck_error_wrong_type.m:
Simplify some code.
browser/declarative_tree.m:
compiler/accumulator.m:
compiler/du_type_layout.m:
compiler/intermod.m:
compiler/mode_errors.m:
compiler/parse_inst_mode_defn.m:
compiler/polyhedron.m:
compiler/split_parse_tree_src.m:
compiler/tag_switch_util.m:
compiler/typecheck_error_unify.m:
compiler/unneeded_code.m:
deep_profiler/mdprof_test.m:
library/getopt.m:
library/getopt_io.m:
Delete unused types reported by the new option.
library/rtti_implementation.m:
Comment out unused type reported by the new option. This type was exported
to both Java and C#, but this diff comments it out because neither language
the Java or the C# runtime system seems to use the exported versions
either. (Bootcheck in both java and csharp grades worked, with the
same number of test case failures as before.) We do not delete it,
because it may be useful in the future.
tests/warnings/help_text.err_exp:
Expect the documentation of the new option.
tests/invalid_nodepend/Mmakefile:
Specify --warn-unused-types for two test cases to test that the compiler
does NOT generate warnings about unused types in the presence of previous
errors.
tests/warnings/abstract_type_decl.err_exp:
tests/warnings/bug412.err_exp:
tests/warnings/warn_dead_procs.err_exp:
Expect the new warnings for unused types.
tests/warnings/Mmakefile:
Specify --warn-unused-types for the three test cases listed above.