Stack overflow in Nightly 0.3

[magistere]

I'm getting stack overflow in latest Windows nightly (Version 0.3.0-prerelease+1864 (2014-03-06 05:43 UTC)):

immutable Pixel
  r::Uint8
  g::Uint8
  b::Uint8
end

Pixel(r,g,b) = Pixel(uint8(r),uint8(g),uint8(b))

function change(a)
  a[3,4] = Pixel(1,2,3)
end

a = Array(Pixel,10,10)
change(a)

Julia output:

Warning: redefining constant CPU_CORES
ERROR: stack overflow
while loading R:\Julia\so.jl, in expression starting on line 14

[ivarne]

This is because you do not need the extra constructor anymore. Ref: #4026

[magistere]

Thanks for answer. But then it will not work in Julia 0.2. Is there any simple way to determine Julia version programmatically?

[ivarne]

if VERSION.major == 0 && VERSION.minor == 2
    Pixel(r,g,b) = Pixel(uint8(r),uint8(g),uint8(b))
end

[IainNZ]

Another "real-life" example:
https://github.com/JuliaOpt/JuMP.jl/blob/master/src/JuMP.jl#L310

[magistere]

Such obvious name :) Thanks, Ivar, Iain.

[carlobaldassi]

Extra tip: versions are more easily and correctly compared like this:

VERSION < v"0.3-"

The - at the end means that this will exclude all pre-release versions of 0.3. To get all 0.2 versions, including pre-releases:

v"0.2-" <= VERSION < v"0.3-"

To get only stable 0.2 versions:

v"0.2" <= VERSION < v"0.3-"

Note that v"0.2" is equivalent to v"0.2.0".
At least version 0.2.1:

VERSION >= v"0.2.1"

and so on.

[magistere]

Thanks Carlo, your answer deserve to be mentioned in documentation. Maybe on FAQ?