Require Elixir v1.7 and fix warnings

.github/workflows/ci.yml

@@ -5,11 +5,11 @@ jobs:
    name: mix test (Elixir ${{ matrix.elixir }} OTP ${{ matrix.otp }})
    strategy:
      matrix:
-       elixir: ['1.6.5', '1.9.1']
+       elixir: ['1.7.4', '1.10.1']
        include:
-         - elixir: '1.6.5'
+         - elixir: '1.7.4'
            otp: '19.x'
-         - elixir: '1.9.1'
+         - elixir: '1.10.1'
            otp: '22.x'
    runs-on: ubuntu-16.04
    steps:

lib/ecto/changeset.ex

@@ -814,7 +814,7 @@ defmodule Ecto.Changeset do
         module.changeset(struct, params)
       rescue
         e in UndefinedFunctionError ->
-          case System.stacktrace() do
+          case __STACKTRACE__ do
             [{^module, :changeset, args_or_arity, _}] when args_or_arity == 2
                                                       when length(args_or_arity) == 2 ->
               raise ArgumentError, """

lib/ecto/query/planner.ex

@@ -203,7 +203,7 @@ defmodule Ecto.Query.Planner do
   rescue
     e ->
       # Reraise errors so we ignore the planner inner stacktrace
-      filter_and_reraise e, System.stacktrace()
+      filter_and_reraise e, __STACKTRACE__
   end
 
   @doc """
@@ -832,7 +832,7 @@ defmodule Ecto.Query.Planner do
   rescue
     e ->
       # Reraise errors so we ignore the planner inner stacktrace
-      filter_and_reraise e, System.stacktrace()
+      filter_and_reraise e, __STACKTRACE__
   end
 
   defp keep_literals?(%{combinations: combinations}), do: combinations != []

lib/ecto/repo/preloader.ex

@@ -51,7 +51,7 @@ defmodule Ecto.Repo.Preloader do
   rescue
     e ->
       # Reraise errors so we ignore the preload inner stacktrace
-      filter_and_reraise e, System.stacktrace()
+      filter_and_reraise e, __STACKTRACE__
   end
 
   ## Preloading

lib/mix/ecto.ex

@@ -65,7 +65,7 @@ defmodule Mix.Ecto do
     Mix.Task.run "loadpaths", args
 
     unless "--no-compile" in args do
-      Mix.Project.compile(args)
+      Mix.Task.run("compile", args)
     end
 
     case Code.ensure_compiled(repo) do

mix.exs

@@ -7,7 +7,7 @@ defmodule Ecto.MixProject do
     [
       app: :ecto,
       version: @version,
-      elixir: "~> 1.6",
+      elixir: "~> 1.7",
       deps: deps(),
       consolidate_protocols: Mix.env() != :test,
 
@@ -23,7 +23,7 @@ defmodule Ecto.MixProject do
 
   def application do
     [
-      extra_applications: [:logger, :crypto],
+      extra_applications: [:logger, :crypto, :eex],
       mod: {Ecto.Application, []}
     ]
   end