Rust also gives a custom error message [0] that explicitly explains that "comparison operators cannot be chained" and shows you how to rewrite the expression using `&&`.

Which makes me wonder whether they came up with this idea themselves or if they borrowed it from D.

In any case, I think that this is the only reasonable solution for new languages. Because if you go with C way it will be surprising for people who expect Python way and vice versa. So, making this syntax illegal is the only way to uphold the principle of least astonishment [1].

[0] https://play.rust-lang.org/?version=stable&mode=debug&editio...

[1] https://en.wikipedia.org/wiki/Principle_of_least_astonishmen...