Define `x // 3` for an interval `x`

[dpsanders]

ff(x) = x // 3

ff(1..2)

gives

ERROR: MethodError: no method matching //(::Interval{Float64}, ::Int64)

[dpsanders]

Similarly for

ff(x) = x // interval(3)

[OlivierHnt]

This was done on purpose because // is a constructor for the Rational type.

This is consistent with eg

julia> 1.0//1
ERROR: MethodError: no method matching //(::Float64, ::Int64)