When trying to install with "cabal install spy" or "stack build" with lts-18.28, I get:

[Former user]

Configuring executable 'spy' for spy-0.14.. Preprocessing executable 'spy' for spy-0.14.. Building executable 'spy' for spy-0.14.. [1 of 4] Compiling Spy.Color ( src/Spy/Color.hs, dist/build/spy/spy-tmp/Spy/Color.o ) [2 of 4] Compiling Spy.Run ( src/Spy/Run.hs, dist/build/spy/spy-tmp/Spy/Run.o ) [3 of 4] Compiling Spy.Watcher ( src/Spy/Watcher.hs, dist/build/spy/spy-tmp/Spy/Watcher.o )

src/Spy/Watcher.hs:97:26: error: • The constructor ‘Added’ should have 3 arguments, but has been given 2 • In the pattern: Added fp _ In a case alternative: (Added fp ) -> printf "%s %s" (added "+|") fp In the expression: case event of (Added fp ) -> printf "%s %s" (added "+|") fp (Modified fp ) -> printf "%s %s" (updated "~|") fp (Removed fp ) -> printf "%s %s" (removed "-|") (ansi Foreground DarkGray fp) | 97 | (Added fp _) -> printf "%s %s" (added "+|") fp | ^^^^^^^^^^