fixes #2585

tests/template/tstmt_semchecked_twice.nim

@@ -0,0 +1,30 @@
+
+# bug #2585
+
+type
+    RenderPass = object
+       state: ref int
+
+    RenderData* = object
+        fb: int
+        walls: seq[RenderPass]
+
+    Mat2 = int
+    Vector2[T] = T
+    Pixels=int
+
+template use*(fb: int, st: stmt) : stmt =
+    echo "a ", $fb
+    st
+    echo "a ", $fb
+
+proc render(rdat: var RenderData; passes: var openarray[RenderPass]; proj: Mat2;
+            indexType = 1) =
+    for i in 0 .. <len(passes):
+        echo "blah ", repr(passes[i])
+
+
+
+proc render2*(rdat: var RenderData; screenSz: Vector2[Pixels]; proj: Mat2) =
+    use rdat.fb:
+        render(rdat, rdat.walls, proj, 1)