Match on correct tuple shape in insert_all placeholder type mismatch check

lib/ecto/repo/schema.ex

@@ -285,7 +285,7 @@ defmodule Ecto.Repo.Schema do
       %{^key => {idx, ^type, _, _}} ->
         {{:placeholder, idx}, placeholder_dump, counter}
 
-      %{^key => {_, type, _}} ->
+      %{^key => {_, type, _, _}} ->
         raise ArgumentError,
               "a placeholder key can only be used with columns of the same type. " <>
                 "The key #{inspect(key)} has already been dumped as a #{inspect(type)}"

test/ecto/repo_test.exs

@@ -960,9 +960,9 @@ defmodule Ecto.RepoTest do
     test "Repo.insert_all raises when placeholder key is used for different types" do
       placeholders = %{uuid_key: Ecto.UUID.generate()}
       ph_key = {:placeholder, :uuid_key}
-      entries = [%{bid: ph_key, string: ph_key}]
+      entries = [%{bid: ph_key, str: ph_key}]
 
-      assert_raise ArgumentError, fn ->
+      assert_raise ArgumentError, ~r/a placeholder key can only be used with columns of the same type/, fn ->
         TestRepo.insert_all(MySchemaWithBinaryId, entries, placeholders: placeholders)
       end
     end