exp/template: simpler parse of char constants. We can avoid the check against empty constants (''), which UnquoteChar doesn't handle well, by leaving on the trailing quote and seeing that's all we have left at the end.
exp/template: simpler parse of char constants.
We can avoid the check against empty constants (''),
which UnquoteChar doesn't handle well, by leaving on
the trailing quote and seeing that's all we have left at the end.

R=golang-dev, dsymonds
CC=golang-dev
http://codereview.appspot.com/4657090
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go