1 files changed, 22 insertions, 0 deletions
diff --git a/tests/views/tcannot_borrow.nim b/tests/views/tcannot_borrow.nim
new file mode 100644
index 000000000..0b8793159
--- /dev/null
+++ b/tests/views/tcannot_borrow.nim
@@ -0,0 +1,22 @@
+discard """
+  errormsg: "cannot borrow"
+  nimout: '''tcannot_borrow.nim(20, 7) Error: cannot borrow meh; what it borrows from is potentially mutated
+tcannot_borrow.nim(21, 3) the mutation is here'''
+"""
+
+
+{.experimental: "views".}
+
+type
+  Foo = object
+    field: string
+
+proc valid(s: var seq[Foo]) =
+  let v: lent Foo = s[0]  # begin of borrow
+  echo v.field            # end of borrow
+  s.setLen 0  # valid because 'v' isn't used afterwards
+
+proc dangerous(s: var seq[Foo]) =
+  let meh: lent Foo = s[0]
+  s.setLen 0
+  echo meh.field