Add test for issue nim-lang#19484

tests/objects/rect.h

@@ -0,0 +1,3 @@
+typedef struct Rectangle {
+    float x,y,width,height;
+} Rectangle;

tests/objects/t19484.nim

@@ -0,0 +1,29 @@
+from os import parentDir, `/`
+
+type
+  Rectangle* {.importc: "Rectangle", header: currentSourcePath().parentDir()/"rect.h", bycopy.} = object
+    x* {.importc: "x".}: cfloat  ##  NmrlbNow_Rectangle top-left corner position x
+    y* {.importc: "y".}: cfloat  ##  NmrlbNow_Rectangle top-left corner position y
+    width* {.importc: "width".}: cfloat ##  NmrlbNow_Rectangle width
+    height* {.importc: "height".}: cfloat ##  NmrlbNow_Rectangle height
+
+  ValueType* = object
+    payload: int
+  Effect* = object
+
+  Node* = object
+    disabled: bool
+    shapepos: Rectangle
+    inputs: seq[ValueType]
+    outputs: seq[ValueType]
+    rails: seq[Effect]
+
+var nodes: seq[Node]
+var node: Node = default(Node)
+let shapepos = Rectangle(x: 12.0, y: 34.0, width: 56.0, height: 78.0)
+node.shapepos = shapepos
+node.inputs.add ValueType(payload:42)
+echo node
+nodes.add node
+echo nodes
+doAssert nodes[0].shapepos.x == shapepos.x