Parse the string `s` as a coordinate pair, like `"400x600"` or `"1.0,0.5"`. Specifically, `s` should have the form , where is the character given by the `separator` argument, and and are both strings that can be parsed by `T::from_str`. If `s` has the proper form, return `Some<(x, y)>`. If it doesn't parse correctly, return `None`.
(s: &str, separator: char)
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