statements after panicln are unreachable, just like after panic.
statements after panicln are unreachable, just like after panic.

missing break after error.

dot symbol bug fix: leave sym alone
(was incorrect for inserted cross-package dots).

R=ken
OCL=31234
CL=31236

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go