6 files changed, 32 insertions, 1 deletions
diff --git a/modules/gdscript/editor/gdscript_highlighter.cpp b/modules/gdscript/editor/gdscript_highlighter.cpp
index aba3e07134..ae1f2893f1 100644
--- a/modules/gdscript/editor/gdscript_highlighter.cpp
+++ b/modules/gdscript/editor/gdscript_highlighter.cpp
@@ -82,6 +82,10 @@ Dictionary GDScriptSyntaxHighlighter::_get_line_syntax_highlighting(int p_line)
 	const String &str = text_edit->get_line(p_line);
 	const int line_length = str.length();
 	Color prev_color;
+
+	if (in_region != -1 && str.length() == 0) {
+		color_region_cache[p_line] = in_region;
+	}
 	for (int j = 0; j < str.length(); j++) {
 		Dictionary highlighter_info;
 
diff --git a/modules/gdscript/gdscript_analyzer.cpp b/modules/gdscript/gdscript_analyzer.cpp
index e2daa8889f..1e72216ad2 100644
--- a/modules/gdscript/gdscript_analyzer.cpp
+++ b/modules/gdscript/gdscript_analyzer.cpp
@@ -71,6 +71,10 @@ static StringName get_real_class_name(const StringName &p_source) {
 	return p_source;
 }
 
+void GDScriptAnalyzer::cleanup() {
+	underscore_map.clear();
+}
+
 static GDScriptParser::DataType make_callable_type(const MethodInfo &p_info) {
 	GDScriptParser::DataType type;
 	type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
@@ -1538,7 +1542,19 @@ void GDScriptAnalyzer::reduce_binary_op(GDScriptParser::BinaryOpNode *p_binary_o
 	if (p_binary_op->left_operand->is_constant && p_binary_op->right_operand->is_constant) {
 		p_binary_op->is_constant = true;
 		if (p_binary_op->variant_op < Variant::OP_MAX) {
-			p_binary_op->reduced_value = Variant::evaluate(p_binary_op->variant_op, p_binary_op->left_operand->reduced_value, p_binary_op->right_operand->reduced_value);
+			bool valid = false;
+			Variant::evaluate(p_binary_op->variant_op, p_binary_op->left_operand->reduced_value, p_binary_op->right_operand->reduced_value, p_binary_op->reduced_value, valid);
+			if (!valid) {
+				if (p_binary_op->reduced_value.get_type() == Variant::STRING) {
+					push_error(vformat(R"(%s in operator %s.)", p_binary_op->reduced_value, Variant::get_operator_name(p_binary_op->variant_op)), p_binary_op);
+				} else {
+					push_error(vformat(R"(Invalid operands to operator %s, %s and %s.".)",
+									   Variant::get_operator_name(p_binary_op->variant_op),
+									   Variant::get_type_name(p_binary_op->left_operand->reduced_value.get_type()),
+									   Variant::get_type_name(p_binary_op->right_operand->reduced_value.get_type())),
+							p_binary_op);
+				}
+			}
 		} else {
 			if (p_binary_op->operation == GDScriptParser::BinaryOpNode::OP_TYPE_TEST) {
 				GDScriptParser::DataType test_type = right_type;
diff --git a/modules/gdscript/gdscript_analyzer.h b/modules/gdscript/gdscript_analyzer.h
index 85183d3272..06d3530cb6 100644
--- a/modules/gdscript/gdscript_analyzer.h
+++ b/modules/gdscript/gdscript_analyzer.h
@@ -113,6 +113,8 @@ public:
 	Error analyze();
 
 	GDScriptAnalyzer(GDScriptParser *p_parser);
+
+	static void cleanup();
 };
 
 #endif // GDSCRIPT_ANALYZER_H
diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index af07457750..1f3e1c1e40 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -94,6 +94,10 @@ Variant::Type GDScriptParser::get_builtin_type(const StringName &p_type) {
 	return Variant::VARIANT_MAX;
 }
 
+void GDScriptParser::cleanup() {
+	builtin_types.clear();
+}
+
 GDScriptFunctions::Function GDScriptParser::get_builtin_function(const StringName &p_name) {
 	for (int i = 0; i < GDScriptFunctions::FUNC_MAX; i++) {
 		if (p_name == GDScriptFunctions::get_func_name(GDScriptFunctions::Function(i))) {
diff --git a/modules/gdscript/gdscript_parser.h b/modules/gdscript/gdscript_parser.h
index a741ae0cc7..c9ab3d4e12 100644
--- a/modules/gdscript/gdscript_parser.h
+++ b/modules/gdscript/gdscript_parser.h
@@ -1335,6 +1335,7 @@ public:
 		void print_tree(const GDScriptParser &p_parser);
 	};
 #endif // DEBUG_ENABLED
+	static void cleanup();
 };
 
 #endif // GDSCRIPT_PARSER_H
diff --git a/modules/gdscript/register_types.cpp b/modules/gdscript/register_types.cpp
index 23c7f97b5a..c554cbac05 100644
--- a/modules/gdscript/register_types.cpp
+++ b/modules/gdscript/register_types.cpp
@@ -35,6 +35,7 @@
 #include "core/os/dir_access.h"
 #include "core/os/file_access.h"
 #include "gdscript.h"
+#include "gdscript_analyzer.h"
 #include "gdscript_cache.h"
 #include "gdscript_tokenizer.h"
 
@@ -148,4 +149,7 @@ void unregister_gdscript_types() {
 	EditorTranslationParser::get_singleton()->remove_parser(gdscript_translation_parser_plugin, EditorTranslationParser::STANDARD);
 	gdscript_translation_parser_plugin.unref();
 #endif // TOOLS_ENABLED
+
+	GDScriptParser::cleanup();
+	GDScriptAnalyzer::cleanup();
 }