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76 lines
1.7 KiB
Mathematica
76 lines
1.7 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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% Test mutables whose initial value expressions throw exceptions.
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:- module mutable_excp.
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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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:- implementation.
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:- import_module exception.
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:- mutable(foo, int, init_foo, ground, [untrailed, attach_to_io_state]).
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:- mutable(bar, int, init_bar, ground, [untrailed, attach_to_io_state]).
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:- mutable(baz, int, init_baz, ground, [untrailed, attach_to_io_state]).
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:- func init_foo = int.
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init_foo = X :-
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promise_equivalent_solutions [X] (
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try(get_string(561), Result),
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(
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Result = succeeded(_),
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X = 80
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;
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Result = exception(_),
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X = 40
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),
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trace [io(!IO)] (
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io.write_string("init_foo: X = ", !IO),
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io.write_int(X, !IO),
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io.nl(!IO),
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io.flush_output(!IO)
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)
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).
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:- func init_bar = int.
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init_bar =
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( if get_magic_number(3) then
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throw(magic_number_exception)
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else
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561
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).
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:- func init_baz = int.
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init_baz = X :-
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trace [io(!IO)] (
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io.write_string("init_baz: I should not be running.\n", !IO)
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),
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X = 10.
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:- pred get_string(int::in, string::out) is det.
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get_string(X, Str) :-
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( if X = 561 then
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throw(magic_number_exception)
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else
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Str = "not 561"
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).
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:- type magic_number_exception
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---> magic_number_exception.
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:- pred get_magic_number(int::out) is det.
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get_magic_number(3).
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main(!IO) :-
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io.write_string("main: I should not be running.\n", !IO).
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