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-rw-r--r--tests/stdlib/tdeques.nim6
1 files changed, 6 insertions, 0 deletions
diff --git a/tests/stdlib/tdeques.nim b/tests/stdlib/tdeques.nim
index 8a788d337..fcfc278a9 100644
--- a/tests/stdlib/tdeques.nim
+++ b/tests/stdlib/tdeques.nim
@@ -183,6 +183,12 @@ proc main() =
     clear(a)
     doAssert len(a) == 0
 
+  block: # bug #21278
+    var a = [10, 20, 30, 40].toDeque
+
+    a.shrink(fromFirst = 0, fromLast = 1)
+    doAssert $a == "[10, 20, 30]"
+
 
 static: main()
 main()