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c1f535b175
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Fix a simplification bug which was introduced with multi-cons_id switch arms.
Previously a singleton switch could be replaced by the case goal, possibly
with a functor test beforehand, but that's only true if the case arm is
applicable to only a single functor.
compiler/simplify.m:
As above.
tests/hard_coded/Mercury.options:
tests/hard_coded/Mmakefile:
tests/hard_coded/simplify_multi_arm_switch.exp:
tests/hard_coded/simplify_multi_arm_switch.m:
Add test case.
52 lines
1.1 KiB
Mathematica
52 lines
1.1 KiB
Mathematica
% Regression test.
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% Previously a singleton switch could be replaced by the case goal, possibly
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% with a functor test beforehand, but that's only true if the case arm is
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% applicable to only a single functor.
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:- module simplify_multi_arm_switch.
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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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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module bool.
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:- type fruit
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---> apple
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; pear
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; banana
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; plum.
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:- pred squishy(fruit::in) is semidet.
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:- pragma no_inline(squishy/1).
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squishy(Fruit) :-
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(
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( Fruit = apple
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; Fruit = pear
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),
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IsSquishy = no
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;
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( Fruit = banana
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; Fruit = plum
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),
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IsSquishy = yes
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),
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IsSquishy = yes.
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main(!IO) :-
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( squishy(apple) ->
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io.write_string("bug!\n", !IO)
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;
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io.write_string("ok\n", !IO)
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).
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%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=8 sts=4 sw=4 et
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