Method ErrorWatcher

liblangutil/ErrorReporter.h:158–161

	{
	public:
		ErrorWatcher(ErrorReporter const& _errorReporter):
			m_errorReporter(_errorReporter),
			m_initialErrorCount(_errorReporter.errorCount())
		{}
		bool ok() const
		{
			solAssert(m_initialErrorCount <= m_errorReporter.errorCount(), "Unexpected error count.");