Type error inconsistency (non-booleans used in boolean contexts)

[zachallaun]

I've run into some strange behavior while trying to define |> as a pipe operator. Yes, yes, I know that | works perfectly well, but |> is more pleasing to my eye, so bear with me. 😇

julia> double(x) = x*2

julia> |>(val, f) = f(val)

julia> 5 |> double
10

julia> (5
       |> double
       |> double)
ERROR: type: non-boolean (Int64) used in boolean context

# Both parse as a :comparison
julia> :(5 |> double).head
:comparison

julia> :(5 |> double |> double).head
:comparison

Perhaps neither of these should be possible and both should be a type error, but this outcome seems unlikely to be intended.

[JeffBezanson]

Sorry, I didn't intend |> to parse as a comparison.

[zachallaun]

You're awesome.