1 files changed, 13 insertions, 0 deletions
diff --git a/libphobos/testsuite/libphobos.gc/recoverfree.d b/libphobos/testsuite/libphobos.gc/recoverfree.d
new file mode 100644
index 00000000000..59c3b4ab597
--- /dev/null
+++ b/libphobos/testsuite/libphobos.gc/recoverfree.d
@@ -0,0 +1,13 @@
+// https://issues.dlang.org/show_bug.cgi?id=20438
+import core.stdc.stdio;
+import core.memory;
+
+void main()
+{
+    auto used0 = GC.stats.usedSize;
+    void* z = GC.malloc(100);
+    GC.free(z);
+    GC.collect();
+    auto used1 = GC.stats.usedSize;
+    used1 <= used0 || assert(false);
+}