Fix concurrent access to Vars (fixes #23).
Fix concurrent access to Vars (fixes #23).

dnephin/gometalinter,alecthomas/gometalinter,jgautheron/gometalinter,cep21/gometalinter,dnephin/gometalinter,dnephin/gometalinter,alecthomas/gometalinter,alecthomas/gometalinter