I committed a patch to upgrade to revision 94d654be2064 of the Go library. That is the library sources as of about 2 weeks ago as I delayed the commit for the 4.6 branch. Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu. Committed to mainline.
The patch is too large to attach to this e-mail, but is available at revision 171076 in the SVN repository. In any case the patch is mostly just the changes from the master Go library. Ian
