Star unpacks as arguments to reveal_type() and assert_type() are not reported

[InSyncWithFoo]

Minimal reproducible example (playground):

cast(*tuple[str, int], ...)                # no error
cast(Unpack[tuple[str, int]], ...)         # error: Unpack is not allowed in this context
cast(**dict[str, int], ...)                # error: "..." is not allowed in this context
cast(Unpack[dict[str, int]], ...)          # error: Unpack is not allowed in this context

assert_type(..., *tuple[str, int])         # error: expected "tuple[str, int]" but received "EllipsisType"
assert_type(..., Unpack[tuple[str, int]])  # error: Unpack is not allowed in this context
assert_type(..., **dict[str, int])         # error: expected "dict[str, int]" but received "EllipsisType"
assert_type(..., Unpack[dict[str, int]])   # error: Unpack is not allowed in this context

Unpack-ed types are not valid in these contexts and should be reported whatever forms they take.

[erictraut]

There are two separate bugs here. One is a missing syntax error check for the case where a positional argument follows an unpacked keyword argument in a call expression (as in cast(**dict[str, int], ...)), and the other missing check is specific to the first positional argument of a cast call. Both of these will be addressed in the next release.