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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.
50 lines
1.3 KiB
Mathematica
50 lines
1.3 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 (second) 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 parse_list.
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:- interface.
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:- import_module io.
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:- import_module list.
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:- import_module std_util.
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:- pred main(io::di, io::uo) is det.
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:- pred meta_parse_list(pred(Y, Y, X), list(X), Y, Y).
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:- mode meta_parse_list(pred(in, out, out) is semidet, out, 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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P = (pred(I::in, O::out, N::out) is semidet :- one_or_two(N, I, O)),
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( if meta_parse_list(P, [X, Y], [2, 1, 3], _) then
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string.int_to_string(X, SX),
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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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meta_parse_list(P, L, In, Out) :-
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( if call(P, In, Out0, E) then
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L = [E | L1],
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meta_parse_list(P, L1, Out0, Out)
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else
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L = [], Out = In
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).
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:- pred one_or_two(int::out, list(int)::in, list(int)::out) is semidet.
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one_or_two(1) --> [1].
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one_or_two(2) --> [2].
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