Remove unnecessary dependencies

flake.nix

@@ -98,7 +98,7 @@
             echo done.
           '';
 
-          psa-args = "--strict --stash --censor-lib";
+          psa-args = "--strict --stash --censor-lib --is-lib=.spago";
 
           runSpago = cmd: ''
             ${spago}/bin/spago ${cmd} --purs-args "${psa-args} --stash"
@@ -150,6 +150,7 @@
               '';
               doCheck = true;
               checkPhase = ''
+                set -e
                 psa compile ${psa-args} ${spagoSources} "./src/**/*.purs" "./test/**/*.purs"
                 node $src/test.js
               '';

spago.dhall

@@ -5,13 +5,11 @@
   [ "aff"
   , "effect"
   , "either"
-  , "freet"
   , "identity"
   , "lists"
   , "maybe"
   , "monad-control"
   , "prelude"
-  , "st"
   , "transformers"
   , "tuples"
   ]