Silence warnings

Author: josevalim

lib/elixir/lib/kernel.ex

@@ -3424,7 +3424,7 @@ defmodule Kernel do
 
   ## Examples
 
-      iex> is_nil(1)
+      iex> is_nil(1 + 2)
       false
 
       iex> is_nil(nil)

lib/elixir/test/elixir/atom_test.exs

@@ -3,7 +3,7 @@ Code.require_file("test_helper.exs", __DIR__)
 defmodule AtomTest do
   use ExUnit.Case, async: true
 
-  doctest Atom
+  doctest Atom, except: [:moduledoc]
 
   test "to_string/1" do
     assert "héllo" |> String.to_atom() |> Atom.to_string() == "héllo"

lib/elixir/test/elixir/kernel/raise_test.exs

@@ -17,7 +17,7 @@ defmodule Kernel.RaiseTest do
       try do
         raise "a"
       rescue
-        _ -> hd(__STACKTRACE__)
+        _ -> Enum.fetch!(__STACKTRACE__, 0)
       end
 
     file = __ENV__.file |> Path.relative_to_cwd() |> String.to_charlist()

lib/elixir/test/elixir/kernel_test.exs

@@ -3,7 +3,8 @@ Code.require_file("test_helper.exs", __DIR__)
 defmodule KernelTest do
   use ExUnit.Case, async: true
 
-  doctest Kernel
+  # Skip these doctests are they emit warnings
+  doctest Kernel, except: [===: 2, !==: 2, is_nil: 1]
 
   def id(arg), do: arg
   def id(arg1, arg2), do: {arg1, arg2}

lib/elixir/test/elixir/macro_test.exs

@@ -379,14 +379,16 @@ defmodule MacroTest do
              """
     end
 
+    defp abc, do: [:a, :b, :c]
+
     test "with a pipeline on a single line" do
-      {result, formatted} = dbg_format([:a, :b, :c] |> tl() |> tl |> Kernel.hd())
+      {result, formatted} = dbg_format(abc() |> tl() |> tl |> Kernel.hd())
       assert result == :c
 
       assert formatted =~ "macro_test.exs"
 
       assert formatted =~ """
-             \n[:a, :b, :c] #=> [:a, :b, :c]
+             \nabc() #=> [:a, :b, :c]
              |> tl() #=> [:b, :c]
              |> tl #=> [:c]
              |> Kernel.hd() #=> :c
@@ -400,7 +402,7 @@ defmodule MacroTest do
     test "with a pipeline on multiple lines" do
       {result, formatted} =
         dbg_format(
-          [:a, :b, :c]
+          abc()
           |> tl()
           |> tl
           |> Kernel.hd()
@@ -411,7 +413,7 @@ defmodule MacroTest do
       assert formatted =~ "macro_test.exs"
 
       assert formatted =~ """
-             \n[:a, :b, :c] #=> [:a, :b, :c]
+             \nabc() #=> [:a, :b, :c]
              |> tl() #=> [:b, :c]
              |> tl #=> [:c]
              |> Kernel.hd() #=> :c