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ecb5e4a9e6
tests/declarative_debugger/*.m:
tests/exceptions/*.m:
tests/general/*.m:
tests/grade_subdirs/*.m:
tests/purity/*.m:
tests/submodules/*.m:
tests/typeclasses/*.m:
Update programming style.
tests/declarative_debugger/*.inp:
Update line numbers in breakpoint commands.
tests/declarative_debugger/*.exp:
Update expected line numbers.
tests/exceptions/Mercury.options:
tests/general/Mercury.options:
Disable some warnings that are irrelevant to the test.
55 lines
1.5 KiB
Mathematica
55 lines
1.5 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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%
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% This module, originally written by Philip Dart,
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% uncovered a bug in the implementation of semidet predicates
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% in Mercury version 0.4.
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%
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:- module semidet_map.
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:- interface.
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:- import_module maybe.
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:- import_module io.
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:- import_module list.
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:- pred main(io::di, io::uo) is det.
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:- pred meta_semidet_map(pred(X, Y), list(X), list(maybe(Y))).
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:- mode meta_semidet_map(pred(in, out) is semidet, in, out) is det.
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:- implementation.
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:- import_module builtin.
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:- import_module int.
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:- import_module string.
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main(!IO) :-
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( if meta_semidet_map(pos_inc, [0, 1], [X, Y]) then
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maybe_to_string(string.int_to_string, X, SX),
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maybe_to_string(string.int_to_string, Y, SY),
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io.write_strings(["Success: X = ", SX, "; Y = ", SY, ".\n"], !IO)
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else
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io.write_string("Failure.\n", !IO)
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).
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:- pred maybe_to_string(pred(X, string), maybe(X), string).
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:- mode maybe_to_string(pred(in, out) is det, in, out) is det.
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maybe_to_string(_, no, "no").
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maybe_to_string(P, yes(T), S) :-
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call(P, T, S0),
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string.append_list(["yes(", S0, ")"], S).
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:- pred pos_inc(int::in, int::out) is semidet.
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pos_inc(X, Y) :-
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X > 0,
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Y = X + 1.
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meta_semidet_map(_, [], []).
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meta_semidet_map(P, [H0 | T0], [H | T]) :-
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( if call(P, H0, H1) then H = yes(H1) else H = no ),
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meta_semidet_map(P, T0, T).
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