Rename Red Knot (#17820)

crates/ty_python_semantic/resources/mdtest/comprehensions/invalid_syntax.md

@@ -0,0 +1,43 @@
+# Comprehensions with invalid syntax
+
+```py
+class IntIterator:
+    def __next__(self) -> int:
+        return 42
+
+class IntIterable:
+    def __iter__(self) -> IntIterator:
+        return IntIterator()
+
+# Missing 'in' keyword.
+
+# It's reasonably clear here what they *meant* to write,
+# so we'll still infer the correct type:
+
+# error: [invalid-syntax] "Expected 'in', found name"
+# revealed: int
+[reveal_type(a) for a IntIterable()]
+
+
+# Missing iteration variable
+
+# error: [invalid-syntax] "Expected an identifier, but found a keyword 'in' that cannot be used here"
+# error: [invalid-syntax] "Expected 'in', found name"
+# error: [unresolved-reference]
+# revealed: Unknown
+[reveal_type(b) for in IntIterable()]
+
+
+# Missing iterable
+
+# error: [invalid-syntax] "Expected an expression"
+# revealed: Unknown
+[reveal_type(c) for c in]
+
+
+# Missing 'in' keyword and missing iterable
+
+# error: [invalid-syntax] "Expected 'in', found ']'"
+# revealed: Unknown
+[reveal_type(d) for d]
+```