Describe the Bug

x is incorrectly marked unbound in the print call

def fun(**kwargs):
    if x := kwargs.get("x") is None:
        x = "a"
    print(x) # x may be unitializec

Sandbox Link

https://pyrefly.org/sandbox/?project=N4IgZglgNgpgziAXKOBDAdgEwEYHsAeAdAA4CeSIAxAAQDqMUAxrgLYzUAuunAFuwAqkATjDBRS1AMoYcBADS8IcakuqpqxVAHMYAHXQ0A7nxHVSuAK7VGGaoaEQOMBXB6pTM6rHfo1eCxycpMQQ6FoqvoIcPLjohPqUCdQAEjAeHtaWxLDUYDCoHBYiyrhgispoWHj4iEkAtNQA4jCBIqhQdRwQbEHE7Ix8jADWoeF5MDiow-XUAKpw7CIAbvlQAPocwTAAFACUnNyhcH2MgaF5QiKYvfAzMPh9DmzogYaOPLzsAJIAIgCiuXyhWKvAKdnYcAsxGIuCEgW2MEIWkIagCuGYLGyLWc1C0uE6%2BMwolCjggsQUMRWQgULUYuxmtAcTjUWGoQgskVI0VimSJ1EwEBEp3EETMliE1GwQlwhgWQn0%2BiJZTAHO2ACo1UNDO4tHBdrVfNQjRAyvhqIgALzULU6uBIlrbXQgfBO-aqABysRgBqNvt9ZqtTtQTv0fuIDhe23w%2BxoZpYqAk2HYHNJ7QgAC8YIwFegVeg9iA5CAAtA7WQKDRZl0oI4JHnTmT0HAc0rcrD4xw1ugLCwk0Io4gIhx9nUAHzUOAcIQ%2B30iYG%2BMBO909vuD4D4AC%2BIfQhZAZBEYlIhC4LCgFeoggPIsqsjNzFzEC0RQKjfiBikMHYPA4HGIcEQAD0AH7qI4iELCWgATA6AAZg6JwAB96QE%2BQgvrEAFthKqBLKg0CoNgORIY%2Bz5dDyuDEKRTZvmQ3LoHUVJwI21CBiAADMhAAIwAEzbiAG5FlMXQrAAYtAMAUDe1QkOQG5AA

(Only applicable for extension issues) IDE Information

No response