bbkr:~ bbkr$ perl6 --version
This is perl6 version 2012.04.1 built on parrot 4.3.0 revision 0
bbkr:~ bbkr$ perl6 -e 'use URI;'
Segmentation fault: 11
(OS X 10.7.3/4, newest XCode from AppStore)
Also confirmed on IRC:
14:53 timotimo: star: use URI;
14:53 p6eval: star 2012.04: OUTPUT«(signal SEGV)»
As noted on IRC, this is likely to be a precompilation issue that several people have noticed since the last release of R*.
Fixed as of perl6 version 2012.07