`in(x, y)` and `y in x` behave differently?

[stevengj]

@filchristou

Consequently I implemented the Base.in

function Base.in(r::MyRange, i::Int)
    return r.starting <= i <= r.ending
end

Your arguments are in the wrong order. x in y is equivalent to in(x, y), not in(y, x).

This wasn’t very explicit in the in docstring, so I submitted a pull request: note infix syntax for "in" and "∈" by stevengj · Pull Request #54091 · JuliaLang/julia · GitHub