Pattern match failure: src/HsDev/Tools/GhcTypes.hs:69:9-11

[bscottm]

Now that I can see stderr's output, new problem:

21/01/17 20:44:54 -0800 TRACE   1/update/task/directory> session: ghc -no-user-package-db
21/01/17 20:44:54 -0800 TRACE   1/update/task/directory> session: ghc -no-user-package-db, -package-db <homedir>/.stack/snapshots/x86_64-osx/nightly-2016-12-31/8.0.1/pkgdb, -package-db <homedir>/play/emuwork/.stack-work/install/x86_64-osx/nightly-2016-12-31/8.0.1/pkgdb
21/01/17 20:44:54 -0800 ERROR   ghc/types> Scope leaves with exception: Pattern match failure in do expression at src/HsDev/Tools/Ghc/Types.hs:69:9-11
21/01/17 20:44:54 -0800 ERROR   ghc> Scope leaves with exception: Pattern match failure in do expression at src/HsDev/Tools/Ghc/Types.hs:69:9-11
21/01/17 20:44:54 -0800 TRACE   3>  << {"error":"ghc error","msg":"Pattern match failure in do expression at src/HsDev/Tools/Ghc/Types.hs:6...