1 files changed, 20 insertions, 0 deletions
diff --git a/tests/concepts/t5968.nim b/tests/concepts/t5968.nim
new file mode 100644
index 000000000..adb374c65
--- /dev/null
+++ b/tests/concepts/t5968.nim
@@ -0,0 +1,20 @@
+discard """
+  exitcode: 0
+"""
+
+type
+  Enumerable[T] = concept e
+    for it in e:
+      it is T
+
+proc cmap[T, G](e: Enumerable[T], fn: proc(t: T): G): seq[G] =
+  result = @[]
+  for it in e: result.add(fn(it))
+
+import json
+
+var x = %["hello", "world"]
+
+var z = x.cmap(proc(it: JsonNode): string = it.getStr & "!")
+assert z == @["hello!", "world!"]
+