Fixed deserializeJson() silently accepting a Stream* (issue #978)

test/Misc/CMakeLists.txt

@@ -13,3 +13,24 @@ add_executable(MiscTests
 
 target_link_libraries(MiscTests catch)
 add_test(Misc MiscTests)
+
+
+add_executable(Issue978
+	Issue978.cpp
+)
+set_target_properties(Issue978
+	PROPERTIES
+    	EXCLUDE_FROM_ALL TRUE
+        EXCLUDE_FROM_DEFAULT_BUILD TRUE
+)
+add_test(
+	NAME
+		Issue978
+    COMMAND
+    	${CMAKE_COMMAND} --build . --target Issue978 --config $<CONFIGURATION>
+    WORKING_DIRECTORY
+    	${CMAKE_BINARY_DIR}
+)
+set_tests_properties(Issue978 
+	PROPERTIES
+		WILL_FAIL TRUE)

test/Misc/Issue978.cpp

@@ -0,0 +1,13 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <ArduinoJson.h>
+
+struct Stream {};
+
+int main() {
+  Stream* stream = 0;
+  DynamicJsonDocument doc(1024);
+  deserializeJson(doc, stream);
+}