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Estimated hours taken: 3.5 Branches: main Split the parse tree (currently defined in prog_data.m) into two separate modules. The reason for doing this is that while over 80% of the modules in the compiler import prog_data, very few of them actually require access to the types that define the parse tree (principally the item type). At the moment even small changes to these types can result in recompiles that rebuild almost all of the compiler. This change shifts the item type (and related types) into a new module, prog_item, that is only imported where these types are required (mostly at the frontend of the compiler). This should reduce the size of recompiles required when the parse tree is modified. This diff does not change any algorithms; it just shifts things around. compiler/prog_data.m: Move the item type and any related types that are not needed after the HLDS has been built to the new prog_item module. Fix bitrot in comments. Fix formatting and layout of comments. Use unexpected/2 in place of error/1 in a spot. compiler/prog_item.m: New file. This module contains any parts of the parse tree that are not needed by the rest of the compiler after the HLDS has been built. compiler/check_typeclass.m: s/list(instance_method)/instance_methods/ compiler/equiv_type.m: compiler/hlds_module.m: compiler/intermod.m: compiler/make.module_dep_file.m: compiler/make_hlds.m: compiler/mercury_compile.m: compiler/mercury_to_mercury.m: compiler/module_qual.m: compiler/modules.m: compiler/parse_tree.m: compiler/prog_io.m: compiler/prog_io_dcg.m: compiler/prog_io_goal.m: compiler/prog_io_pragma.m: compiler/prog_io_typeclass.m: compiler/prog_io_util.m: compiler/prog_out.m: compiler/prog_util.m: compiler/recompilation.check.m: compiler/recompilation.usage.m: compiler/recompilation.version.m: compiler/trans_opt.m: Conform to the above changes. compiler/notes/compiler_design.html: Mention the new module.