Enable more C++ compiler warnings

test/libsolidity/SemVerMatcher.cpp

@@ -38,6 +38,9 @@ namespace solidity::frontend::test
 
 BOOST_AUTO_TEST_SUITE(SemVerMatcher)
 
+namespace
+{
+
 SemVerMatchExpression parseExpression(string const& _input)
 {
 	Scanner scanner{CharStream(_input, "")};
@@ -62,6 +65,8 @@ SemVerMatchExpression parseExpression(string const& _input)
 	return expression;
 }
 
+}
+
 BOOST_AUTO_TEST_CASE(positive_range)
 {
 	// Positive range tests

test/libsolidity/util/TestFileParserTests.cpp

@@ -39,6 +39,9 @@ namespace solidity::frontend::test
 using fmt = ExecutionFramework;
 using Mode = FunctionCall::DisplayMode;
 
+namespace
+{
+
 vector<FunctionCall> parse(string const& _source)
 {
 	istringstream stream{_source, ios_base::out};
@@ -86,6 +89,8 @@ void testFunctionCall(
 	BOOST_REQUIRE_EQUAL(_call.kind == FunctionCall::Kind::Library, _isLibrary);
 }
 
+}
+
 BOOST_AUTO_TEST_SUITE(TestFileParserTest)
 
 BOOST_AUTO_TEST_CASE(smoke_test)