Merge pull request #94635 from dalexeev/gds-fix-false-positive-enum-without-default

GDScript: Fix false positive cases of `ENUM_VARIABLE_WITHOUT_DEFAULT`

Author: akien-mga

modules/gdscript/gdscript_analyzer.cpp

@@ -1967,8 +1967,8 @@ void GDScriptAnalyzer::resolve_assignable(GDScriptParser::AssignableNode *p_assi
 	}
 
 #ifdef DEBUG_ENABLED
+	const bool is_parameter = p_assignable->type == GDScriptParser::Node::PARAMETER;
 	if (!has_specified_type) {
-		const bool is_parameter = p_assignable->type == GDScriptParser::Node::PARAMETER;
 		const String declaration_type = is_constant ? "Constant" : (is_parameter ? "Parameter" : "Variable");
 		if (p_assignable->infer_datatype || is_constant) {
 			// Do not produce the `INFERRED_DECLARATION` warning on type import because there is no way to specify the true type.
@@ -1980,7 +1980,7 @@ void GDScriptAnalyzer::resolve_assignable(GDScriptParser::AssignableNode *p_assi
 		} else {
 			parser->push_warning(p_assignable, GDScriptWarning::UNTYPED_DECLARATION, declaration_type, p_assignable->identifier->name);
 		}
-	} else if (specified_type.kind == GDScriptParser::DataType::ENUM && p_assignable->initializer == nullptr) {
+	} else if (!is_parameter && specified_type.kind == GDScriptParser::DataType::ENUM && p_assignable->initializer == nullptr) {
 		// Warn about enum variables without default value. Unless the enum defines the "0" value, then it's fine.
 		bool has_zero_value = false;
 		for (const KeyValue<StringName, int64_t> &kv : specified_type.enum_values) {

modules/gdscript/tests/scripts/analyzer/warnings/enum_without_default_value.gd

@@ -7,3 +7,17 @@ var has_no_zero: HasNoZero # Warning, because there is no `0` in the enum.
 func test():
 	print(has_zero)
 	print(has_no_zero)
+
+
+# GH-94634. A parameter is either mandatory or has a default value.
+func test_no_exec(param: HasNoZero) -> void:
+	print(param)
+
+	# Loop iterator always has a value.
+	for i: HasNoZero in HasNoZero.values():
+		print(i)
+
+	match param:
+		# Pattern bind always has a value.
+		var x:
+			print(x)