Avoid compilation error with GCC 12
Make operator<< for iteratable objects visible prior to call site like it is already done in other places.
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@ -14,6 +14,7 @@
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#include <c++utilities/io/misc.h>
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#include <c++utilities/io/misc.h>
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#include <c++utilities/tests/testutils.h>
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#include <c++utilities/tests/testutils.h>
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using CppUtilities::operator<<; // must be visible prior to the call site
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#include <cppunit/TestFixture.h>
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#include <cppunit/TestFixture.h>
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#include <cppunit/extensions/HelperMacros.h>
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#include <cppunit/extensions/HelperMacros.h>
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