close #14847(add testcase for #14847) (#16045)

(cherry picked from commit 1bcc352137)

tests/macros/t14847.nim

@@ -0,0 +1,20 @@
+discard """
+  output: "98"
+"""
+import macros
+
+#bug #14847
+proc hello*(b: string) =
+  echo b
+
+macro dispatch(pro: typed, params: untyped): untyped =
+  var impl = pro.getImpl
+  let id = ident(pro.strVal & "_coverage")
+  impl[0] = id
+  let call = newCall(id, params)
+
+  result = newStmtList()
+  result.add(impl)
+  result.add(call)
+
+dispatch(hello, "98")