fixes #5140

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/cpp/tdont_init_instantiation.nim b/tests/cpp/tdont_init_instantiation.nim
new file mode 100644
index 000000000..7d4bf322a
--- /dev/null
+++ b/tests/cpp/tdont_init_instantiation.nim
@@ -0,0 +1,28 @@
+discard """
+  cmd: "nim cpp $file"
+  output: ''''''
+"""
+
+# bug #5140
+{.emit:"""
+#import <cassert>
+
+template <typename X> class C {
+  public:
+    int d;
+
+    C(): d(1) { }
+
+    C<X>& operator=(const C<X> other) {
+      assert(d == 1);
+    }
+};
+""".}
+
+type C{.importcpp, header: "<stdio.h>", nodecl.} [X] = object
+proc mkC[X]: C[X] {.importcpp: "C<'*0>()", constructor, nodecl.}
+
+proc foo(): C[int] =
+  result = mkC[int]()
+
+discard foo()