[m-rev.] diff: fix Mantis bug 238

[Zoltan Somogyi]

compiler/mercury_compile.m:
	Fix Mantis bug 238.

tests/invalid/bug238.{m,err_exp}:
	New test case for Mantis bug 238.

tests/invalid/Mmakefile:
tests/invalid/Mercury.options:
	Enable the new test case.

Zoltan.

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Index: compiler/mercury_compile.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/mercury_compile.m,v
retrieving revision 1.516
diff -u -b -r1.516 mercury_compile.m
--- compiler/mercury_compile.m	15 Sep 2011 18:00:34 -0000	1.516
+++ compiler/mercury_compile.m	1 Dec 2011 04:12:44 -0000
@@ -1583,7 +1583,8 @@
         HLDS1, HLDS20, !DumpInfo, !Specs, !IO),
     (
         Errors1 = no,
-        Errors2 = no
+        Errors2 = no,
+        contains_errors(Globals, !.Specs) = no
     ->
         globals.lookup_bool_option(Globals, verbose, Verbose),
         globals.lookup_bool_option(Globals, statistics, Stats),
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Index: tests/invalid/Mercury.options
===================================================================
RCS file: /home/mercury/mercury1/repository/tests/invalid/Mercury.options,v
retrieving revision 1.35
diff -u -b -r1.35 Mercury.options
--- tests/invalid/Mercury.options	30 Mar 2010 23:57:27 -0000	1.35
+++ tests/invalid/Mercury.options	1 Dec 2011 04:16:41 -0000
@@ -12,6 +12,8 @@
 				--verbose-error-messages
 
 MCFLAGS-actual_expected =       --no-intermodule-optimization
+# Mantis bug 238 shows up in bug238.m only with --constraint-propagation.
+MCFLAGS-bug238 =		--constraint-propagation
 MCFLAGS-children =		--no-intermodule-optimization
 MCFLAGS-duplicate_modes	=	--verbose-error-messages
 MCFLAGS-ee_invalid = 		--verbose-error-messages
Index: tests/invalid/Mmakefile
===================================================================
RCS file: /home/mercury/mercury1/repository/tests/invalid/Mmakefile,v
retrieving revision 1.248
diff -u -b -r1.248 Mmakefile
--- tests/invalid/Mmakefile	14 Nov 2011 05:48:23 -0000	1.248
+++ tests/invalid/Mmakefile	1 Dec 2011 04:16:59 -0000
@@ -50,6 +50,7 @@
 	bug113 \
 	bug150 \
 	bug197 \
+	bug238 \
 	bug83 \
 	builtin_int \
 	builtin_proc \
Index: tests/invalid/bug238.err_exp
===================================================================
RCS file: tests/invalid/bug238.err_exp
diff -N tests/invalid/bug238.err_exp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ tests/invalid/bug238.err_exp	1 Dec 2011 04:15:47 -0000
@@ -0,0 +1,4 @@
+bug238.m:022: Error: call to predicate `solutions.unsorted_solutions'/2 with
+bug238.m:022:   determinism `cc_multi' occurs in a context which requires all
+bug238.m:022:   solutions.
+bug238.m:022:   Unification of V_2 and V_5 can fail.
Index: tests/invalid/bug238.m
===================================================================
RCS file: tests/invalid/bug238.m
diff -N tests/invalid/bug238.m
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ tests/invalid/bug238.m	1 Dec 2011 04:15:25 -0000
@@ -0,0 +1,25 @@
+% vim: ts=4 sw=4 et ft=mercury
+%
+% This is a regression test for Mantis bug 238.
+%
+% The symptom of that bug was a compiler abort, caused by the fact that
+% the front end invoked the middle end even if the front end found the
+% error in the code below.
+
+:- module bug238.
+
+:- interface.
+
+:- pred foo is semidet.
+
+:- implementation.
+
+:- import_module list.
+:- import_module solutions.
+
+foo :-
+    promise_equivalent_solutions [] (
+        unsorted_solutions(
+            pred(3::out) is nondet,
+            [])
+    ).
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