@@ -0,0 +1,342 @@
+%22%22%22%0Acategories: Syntax,Operators%0Adescription: MicroPython allows using := to assign to the variable of a comprehension, CPython raises a SyntaxError.%0Acause: MicroPython is optimised for code size and doesn't check this case.%0Aworkaround: Do not rely on this behaviour if writing CPython compatible code.%0A%22%22%22%0Aprint(%5Bi := -1 for i in range(4)%5D)%0A

Add CPy diff test for assignment expression behaviour.