Enable more C++ compiler warnings

test/tools/IsolTestOptions.cpp

@@ -35,6 +35,9 @@ namespace po = boost::program_options;
 namespace solidity::test
 {
 
+namespace
+{
+
 auto const description = R"(isoltest, tool for interactively managing test contracts.
 Usage: isoltest [Options]
 Interactively validates test contracts.
@@ -51,6 +54,8 @@ std::string editorPath()
 	return std::string{};
 }
 
+}
+
 IsolTestOptions::IsolTestOptions(std::string* _editor):
 	CommonOptions(description)
 {