1 files changed, 19 insertions, 0 deletions
diff --git a/tests/effects/tfuncs_cannot_mutate_simple.nim b/tests/effects/tfuncs_cannot_mutate_simple.nim
new file mode 100644
index 000000000..0ae4a0db9
--- /dev/null
+++ b/tests/effects/tfuncs_cannot_mutate_simple.nim
@@ -0,0 +1,19 @@
+discard """
+  errormsg: '''cannot mutate location x.data within a strict func'''
+  line: 15
+"""
+
+{.experimental: "strictFuncs".}
+
+# bug #15508
+
+type
+  MyType = ref object
+    data: string
+
+func edit(x: MyType) =
+  x.data = "hello"
+
+let x = MyType()
+x.edit()
+echo x.data