[S05] spec that /$var/ warns and fails if $var is undefined
[S05] spec that /$var/ warns and fails if $var is undefined


git-svn-id: 53605643c415f7495558be95614cf14171f1db78@28899 c213334d-75ef-0310-aa23-eaa082d1ae64

prammer/specs,perl6/specs,prammer/specs,prammer/specs,perl6/specs,tokuhirom/specs,tokuhirom/specs,tokuhirom/specs