Rename Red Knot (#17820)

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

@@ -0,0 +1,44 @@
+# Invalid signatures
+
+## Multiple arguments with the same name
+
+We always map a keyword argument to the first parameter of that name.
+
+```py
+# error: [invalid-syntax] "Duplicate parameter "x""
+def f(x: int, x: str) -> int:
+    return 1
+
+# error: 13 [missing-argument] "No argument provided for required parameter `x` of function `f`"
+# error: 18 [parameter-already-assigned] "Multiple values provided for parameter `x` of function `f`"
+reveal_type(f(1, x=2))  # revealed: int
+```
+
+## Positional after non-positional
+
+When parameter kinds are given in an invalid order, we emit a diagnostic and implicitly reorder them
+to the valid order:
+
+```py
+# error: [invalid-syntax] "Parameter cannot follow var-keyword parameter"
+def f(**kw: int, x: str) -> int:
+    return 1
+
+# error: 15 [invalid-argument-type] "Argument to this function is incorrect: Expected `str`, found `Literal[1]`"
+reveal_type(f(1))  # revealed: int
+```
+
+## Non-defaulted after defaulted
+
+We emit a syntax diagnostic for this, but it doesn't cause any problems for binding.
+
+```py
+# error: [invalid-syntax] "Parameter without a default cannot follow a parameter with a default"
+def f(x: int = 1, y: str) -> int:
+    return 1
+
+reveal_type(f(y="foo"))  # revealed: int
+# error: [invalid-argument-type] "Argument to this function is incorrect: Expected `int`, found `Literal["foo"]`"
+# error: [missing-argument] "No argument provided for required parameter `y` of function `f`"
+reveal_type(f("foo"))  # revealed: int
+```