diff --git a/tests/lean/noTabs.lean b/tests/lean/noTabs.lean
new file mode 100644
index 0000000000..9475259eba
--- /dev/null
+++ b/tests/lean/noTabs.lean
@@ -0,0 +1,4 @@
+#check
+  let a := 1
+	let b := 2
+  a + b
diff --git a/tests/lean/noTabs.lean.expected.out b/tests/lean/noTabs.lean.expected.out
new file mode 100644
index 0000000000..6037902e5c
--- /dev/null
+++ b/tests/lean/noTabs.lean.expected.out
@@ -0,0 +1 @@
+noTabs.lean:3:0: error: tabs are not allowed; please configure your editor to expand them