Notice how the constant "pi" causes an error in rad2deg(). I would think that this is a common use case for this function. Also notice how if it was multiplied by 1.0 and error did not happen.
This is happening in in Version 0.3.1.
...Archie
julia> pi
π = 3.1415926535897...
julia> rad2deg(pi)
ERROR: `convert` has no method matching convert(::Type{MathConst{:π}},
::Float64
)
in rad2deg at math.jl:81
julia> rad2deg(1.0 * pi)
180.0
