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https://github.com/Mercury-Language/mercury.git
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ac70f6d36b
This change implements parsing, typechecking, and modechecking of
"coerce" expressions from my subtypes proposal, i.e. coerce(Term).
Backends currently will abort if asked to generate code for coercions,
as subtypes do not yet share data representations with their base types,
so most coercions would lead to crashes at runtime anyway.
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compiler/hlds_goal.m:
Add new type of generic_call to represent coerce expressions.
compiler/hlds_pred.m:
Add new generic_call_id for coerce expressions.
compiler/superhomogeneous.m:
Treat var-functor unifications of the form "Var = coerce(Term)"
as special, producing coerce generic_calls.
----------------
compiler/type_assign.m:
Add a field to type_assign to hold coerce constraints to be checked,
or known to be unsatisfiable, in the given type assignment.
compiler/typecheck.m:
compiler/typecheck_errors.m:
Implement typechecking of coerce expressions.
compiler/prog_type.m:
Add a predicate type_is_ground_except_vars.
----------------
compiler/check_hlds.m:
Add new module modecheck_coerce.
compiler/modecheck_coerce.m:
Implement modechecking of coerce expressions.
compiler/modecheck_goal.m:
Call modecheck_coerce at a coerce generic call.
compiler/mode_errors.m:
Add two mode errors relating to coerce expressions.
----------------
compiler/arg_info.m:
compiler/build_mode_constraints.m:
compiler/bytecode_gen.m:
compiler/call_gen.m:
compiler/coverage_profiling.m:
compiler/deep_profiling.m:
compiler/exception_analysis.m:
compiler/float_regs.m:
compiler/follow_vars.m:
compiler/goal_util.m:
compiler/higher_order.m:
compiler/hlds_desc.m:
compiler/hlds_out_goal.m:
compiler/hlds_out_util.m:
compiler/intermod.m:
compiler/interval.m:
compiler/lambda.m:
compiler/live_vars.m:
compiler/ml_call_gen.m:
compiler/ml_code_gen.m:
compiler/mode_constraints.m:
compiler/old_type_constraints.m:
compiler/post_typecheck.m:
compiler/pre_quantification.m:
compiler/tabling_analysis.m:
compiler/term_traversal.m:
compiler/trailing_analysis.m:
compiler/tupling.m:
compiler/unique_modes.m:
compiler/unused_imports.m:
compiler/purity.m:
compiler/simplify_goal.m:
compiler/simplify_goal_call.m:
compiler/structure_reuse.direct.detect_garbage.m:
compiler/structure_reuse.indirect.m:
compiler/structure_sharing.analysis.m:
Conform to changes.
compiler/prog_rep.m:
Conform to changes. Reuse cast_rep for coercions for now.
compiler/hlds_statistics.m:
Count coercions in proc stats.
----------------
tests/invalid/Mercury.options:
tests/invalid/Mmakefile:
tests/invalid/coerce_ambig.err_exp:
tests/invalid/coerce_ambig.m:
tests/invalid/coerce_clobbered.err_exp:
tests/invalid/coerce_clobbered.m:
tests/invalid/coerce_disambig.err_exp:
tests/invalid/coerce_disambig.m:
tests/invalid/coerce_implied_mode.err_exp:
tests/invalid/coerce_implied_mode.m:
tests/invalid/coerce_infer.err_exp:
tests/invalid/coerce_infer.m:
tests/invalid/coerce_instvar.err_exp:
tests/invalid/coerce_instvar.m:
tests/invalid/coerce_mode_error.err_exp:
tests/invalid/coerce_mode_error.m:
tests/invalid/coerce_non_du.err_exp:
tests/invalid/coerce_non_du.m:
tests/invalid/coerce_syntax.err_exp:
tests/invalid/coerce_syntax.m:
tests/invalid/coerce_type_error.err_exp:
tests/invalid/coerce_type_error.m:
tests/invalid/coerce_unify_tvars.err_exp:
tests/invalid/coerce_unify_tvars.m:
tests/invalid/coerce_uniq.err_exp:
tests/invalid/coerce_uniq.m:
tests/invalid/coerce_unreachable.err_exp:
tests/invalid/coerce_unreachable.m:
tests/invalid/coerce_void.err_exp:
tests/invalid/coerce_void.m:
Add test cases.
tests/typeclasses/arbitrary_constraint_class.m:
tests/typeclasses/arbitrary_constraint_pred_1.m:
tests/typeclasses/arbitrary_constraint_pred_2.m:
Wrap parentheses around calls to a coerce/1 method
to prevent them being treated as coerce expressions.
----------------
doc/reference_manual.texi:
Rewrite chapter on Type conversions (still commented out).
In particular, the typechecking rules that I had written
previously were insufficient.
NEWS:
Mention backwards incompatibility.
21 lines
485 B
Mathematica
21 lines
485 B
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module coerce_void.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module list.
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main(!IO) :-
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List = coerce([]) : list(T),
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io.print_line(List, !IO).
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