1 files changed, 33 insertions, 0 deletions
diff --git a/tests/gc/trace_globals.nim b/tests/gc/trace_globals.nim
new file mode 100644
index 000000000..f62a15692
--- /dev/null
+++ b/tests/gc/trace_globals.nim
@@ -0,0 +1,33 @@
+discard """
+  output: '''
+10000000
+10000000
+10000000'''
+"""
+
+# bug #17085
+
+#[
+refs https://github.com/nim-lang/Nim/issues/17085#issuecomment-786466595
+with --gc:boehm, this warning sometimes gets generated:
+Warning: Repeated allocation of very large block (appr. size 14880768):
+May lead to memory leak and poor performance.
+nim CI now runs this test with `testWithoutBoehm` to avoid running it with --gc:boehm.
+]#
+
+proc init(): string =
+  for a in 0..<10000000:
+    result.add 'c'
+
+proc f() =
+  var a {.global.} = init()
+  var b {.global.} = init()
+  var c {.global.} = init()
+
+  echo a.len
+    # `echo` intentional according to
+    # https://github.com/nim-lang/Nim/pull/17469/files/0c9e94cb6b9ebca9da7cb19a063fba7aa409748e#r600016573
+  echo b.len
+  echo c.len
+
+f()