diff --git a/env.ps1 b/env.ps1
index 506a7f7..8b94a1d 100644
--- a/env.ps1
+++ b/env.ps1
@@ -30,12 +30,16 @@
 
 If (Test-Path -Path venv\.stamp) { Activate } Else { Setup }
 
+# NOTE: PowerShell functions always return success even if the commands inside
+# failed. This makes it infeasible to do proper error checking.
+# See https://github.com/PowerShell/PowerShell/issues/12218
+
 Function Global:dotidy { black src tests build.py }
 Function Global:dolint { flake8 src tests build.py }
 Function Global:dotest { pytest -q -n auto -x -l --sw --hypothesis-profile=dev $args }
 Function Global:dotest_ci { pytest -q -n auto --hypothesis-profile=ci }
 Function Global:dotest_long { pytest -q -n auto --hypothesis-profile=long }
-Function Global:docheck { dotidy && dolint && dotest }
+Function Global:docheck { dotidy; dolint; dotest }
 Function Global:_envps1_domut { mutmut run --paths-to-mutate "src/token.py,src/tokenize.py,src/parse.py" $args }
 Function Global:domut { _envps1_domut }
 Function Global:domut_ci { _envps1_domut --no-progress || mutmut results }