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https://github.com/Mercury-Language/mercury.git
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c0f26351ec
compiler/equiv_type.m:
As above.
tests/hard_coded/inst_alias.{m,exp}:
A test case proving the comment.
tests/hard_coded/Mmakefile:
Enable the new test case.
58 lines
944 B
Mathematica
58 lines
944 B
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module inst_alias.
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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 string.
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main(!IO) :-
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p1(1, T1),
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q(T1, S1),
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io.write_string(S1, !IO),
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io.nl(!IO),
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p2("abc", T2),
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q(T2, S2),
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io.write_string(S2, !IO),
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io.nl(!IO).
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:- type t
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---> f1(int)
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; f2(string).
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:- inst i1 == i2.
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:- inst i2
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---> f1(ground)
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; f2(i3).
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:- inst i3 == i4.
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:- inst i4
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---> "abc".
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:- pred p1(int::in, t::out(i1)) is det.
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p1(N, f1(N)).
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:- pred p2(string::in(i3), t::out(i1)) is det.
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p2(S, f2(S)).
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:- pred q(t::in(i1), string::out) is det.
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q(T, S) :-
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(
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T = f1(N),
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string.int_to_string(N, S)
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;
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T = f2(S)
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).
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