Add isInstanceOf for generic procs to the macros module (#9730)

tests/macros/tgetimpl.nim

@@ -46,3 +46,22 @@ static:
   doAssert isSameOwner(foo, poo)
   doAssert isSameOwner(foo, echo) == false
   doAssert isSameOwner(poo, len) == false
+
+#---------------------------------------------------------------
+
+macro check_gen_proc(ex: typed): (bool, bool) =
+  let lenChoice = bindsym"len"
+  var is_equal = false 
+  var is_instance_of = false 
+  for child in lenChoice:
+    if not is_equal:
+      is_equal = ex[0] == child
+    if not is_instance_of:
+      is_instance_of = isInstantiationOf(ex[0], child)
+         
+  result = nnkTupleConstr.newTree(newLit(is_equal), newLit(is_instance_of))
+
+# check that len(seq[int]) is not equal to bindSym"len", but is instance of it
+let a = @[1,2,3]
+assert: check_gen_proc(len(a)) == (false, true)
+