@dpsutton Yes. coal-mine's script/test honors the CLJS_VERSION environment variable, so if you do a local build of ClojureScript with a patch applied, and it builds, say, 1.9.1002, then you can go into coal-mine's dir and do

CLJS_VERSION=1.9.1002 script/test

(Perhaps in the future, we could use deps.edn to point coal-mine directly at the ClojureScript source tree, but for now, this environment variable works.)