More on #16110 (#16130)

* fix #16110

* refs #16110

* fix comment

* Trigger build

* use shallowCopy for efficiency

tests/macros/tgetimpl.nim

@@ -71,15 +71,30 @@ assert: check_gen_proc(len(a)) == (false, true)
 
 macro check(x: type): untyped =
   let z = getType(x)
-  let y = getImpl(z[1])
-  echo z.treeRepr
+  let y = getImpl(z[1])  
+  let sym = if y[0].kind == nnkSym: y[0] else: y[0][0]
   expectKind(z[1], nnkSym)
-  expectKind(y[0], nnkSym)
-  doAssert(y[0] == z[1])
+  expectKind(sym, nnkSym)
+  expectKind(y[2], nnkObjectTy)
+  doAssert(sym == z[1])
 
 type
   TirePtr = ptr object
     code: int
 
-var z: TirePtr
-check(typeof(z[]))
+  TireRef* = ref object
+    code: int
+
+  TireRef2* {.inheritable.} = ref object
+    code: int
+
+  TireRef3* {.inheritable.} = object
+    code: int
+
+var z1: TirePtr
+check(typeof(z1[]))
+var z2: TireRef
+check(typeof(z2[]))
+var z3: TireRef2
+check(typeof(z3[]))
+check(TireRef3)