Fix warning in tests and some doctest whitespace (#14194)

* Fix whitespace in iex> docstrings

* Fix type warning in test

* Fix negative step warning in test compilation

* Remove raise assertion

Author: sabiwara

lib/elixir/lib/access.ex

@@ -1040,9 +1040,9 @@ defmodule Access do
       iex> list = [%{name: "john", salary: 10}, %{name: "francine", salary: 30}]
       iex> get_in(list, [Access.find(&(&1.salary > 20)), :name])
       "francine"
-      iex>  get_and_update_in(list, [Access.find(&(&1.salary <= 40)), :name], fn prev ->
-      ...> {prev, String.upcase(prev)}
-      ...>  end)
+      iex> get_and_update_in(list, [Access.find(&(&1.salary <= 40)), :name], fn prev ->
+      ...>   {prev, String.upcase(prev)}
+      ...> end)
       {"john", [%{name: "JOHN", salary: 10}, %{name: "francine", salary: 30}]}
 
   `find/1` can also be used to pop the first found element out of a list or
@@ -1069,7 +1069,7 @@ defmodule Access do
 
   An error is raised if the accessed structure is not a list:
 
-      iex>  get_in(%{}, [Access.find(fn a -> a == 10 end)])
+      iex> get_in(%{}, [Access.find(fn a -> a == 10 end)])
       ** (RuntimeError) Access.find/1 expected a list, got: %{}
   """
   @doc since: "1.17.0"

lib/elixir/lib/calendar/date.ex

@@ -36,7 +36,7 @@ defmodule Date do
   using `Enum.min/2` and `Enum.max/2` functions to get the minimum and
   maximum date of an `Enum`. For example:
 
-      iex>  Enum.min([~D[2017-03-31], ~D[2017-04-01]], Date)
+      iex> Enum.min([~D[2017-03-31], ~D[2017-04-01]], Date)
       ~D[2017-03-31]
 
   ## Using epochs

lib/elixir/test/elixir/calendar/date_range_test.exs

@@ -10,7 +10,7 @@ defmodule Date.RangeTest do
   @asc_range_duration_2 Date.range(~D[2000-01-01], Duration.new!(year: 1), 2)
   @desc_range Date.range(~D[2001-01-01], ~D[2000-01-01], -1)
   @desc_range_2 Date.range(~D[2001-01-01], ~D[2000-01-01], -2)
-  @desc_range_duration Date.range(~D[2001-01-01], Duration.new!(year: -1))
+  @desc_range_duration Date.range(~D[2001-01-01], Duration.new!(year: -1), -1)
   @desc_range_duration_2 Date.range(~D[2001-01-01], Duration.new!(year: -1), 2)
   @empty_range Date.range(~D[2001-01-01], ~D[2000-01-01], 1)
 
@@ -182,6 +182,16 @@ defmodule Date.RangeTest do
     end
   end
 
+  test "warns when inferring a negative step" do
+    {result, captured} =
+      ExUnit.CaptureIO.with_io(:stderr, fn ->
+        Date.range(~D[2001-01-01], Duration.new!(year: -1))
+      end)
+
+    assert result == Date.range(~D[2001-01-01], ~D[2000-01-01], -1)
+    assert captured =~ "negative range was inferred for Date.range/2"
+  end
+
   describe "old date ranges" do
     test "inspect" do
       asc = %{

lib/elixir/test/elixir/version_test.exs

@@ -316,10 +316,6 @@ defmodule VersionTest do
   test "compile_requirement/1" do
     {:ok, req} = Version.parse_requirement("1.2.3")
     assert req == Version.compile_requirement(req)
-
-    assert_raise(FunctionClauseError, fn ->
-      Version.compile_requirement("~> 1.2.3")
-    end)
   end
 
   test "compile requirement" do