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502ea379e4
compiler/det_report.m:
Generate an error message if a require_complete_switch [X] scope
is wrapped around a goal that is not a switch on X.
doc/reference_manual.texi:
Update the reference manual to document this change. Also fix an
old documentation problem: require_complete_switch scopes do NOT
require covering all the function symbols in the type of the
switch-on variable if the switched-on variable's inst says that
it cannot be bound to some of them.
compiler/hlds_goal.m:
Update the comment on the require_complete_switch scope
in the same way.
NEWS:
Announce the change.
tests/warnings/bug257.{m,exp}:
tests/invalid/bug257.{m,err_exp}:
tests/warnings/Mmakefile:
tests/invalid/Mmakefile:
For the bug257.m test case, which has a require_complete_switch [X] scope
around a goal that is not a switch on X, expect the error message
we now generate, not the old warning.
Since the compilation of bug257.m now fails, move it from warnings
to invalid.
tests/valid/Mmakefile:
Disable the bug257b.m test case, which also had a
require_complete_switch [X] scope around a goal that was not a switch on X.
tests/valid/bug257b.m:
Document that this test case is now disabled, and why.
27 lines
638 B
Mathematica
27 lines
638 B
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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% Regression test for bug #257: the compiler was not issuing a warning about
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% the fact that the variable Gee which was the subject of a
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% require_complete_switch did not occur in the scoped goal.
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:- module bug257.
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:- interface.
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:- type xyz ---> x ; y ; z.
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:- pred oops(xyz::in, int::out) is semidet.
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:- implementation.
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oops(G, N) :-
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require_complete_switch [Gee]
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(
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G = x,
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N = 1
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;
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G = y,
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fail
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).
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