Delete needless begin and rescue for channel
" if @queue.empty?\n" \
" _h2o__channel_wait(self)\n" \
" end\n" \
- " begin\n" \
- " ret = @queue.shift\n" \
- " rescue => ex\n" \
- " raise ex\n" \
- " end\n" \
- " ret\n" \
+ " @queue.shift\n" \
" end\n" \
" end\n" \
"end\n"
