Irb problem with swiss german keyboard layout on windows xp

Hi

I can’t use string interpolation in irb,
when using the “swiss german” keyboard layout and windows xp console.

When I try to enter this:

irb(main):001:0> print " test #{}"

it’s turned into this:

irb(main):001:0> #print "test
irb(main):002:0* {}

I guess this is a bug. If so where do I report it?

Thanks