No need to wrap quote do: nil in a block

Author: José Valim

lib/elixir/src/elixir_parser.yrl

@@ -506,7 +506,6 @@ build_tuple(Marker, Args) ->
 
 %% Blocks
 
-build_block([nil])                                      -> { '__block__', [], [nil] };
 build_block([{Op,_,[_]}]=Exprs) when ?rearrange_uop(Op) -> { '__block__', [], Exprs };
 build_block([{unquote_splicing,_,Args}]=Exprs) when
                                       length(Args) =< 2 -> { '__block__', [], Exprs };

lib/elixir/test/elixir/kernel/quote_test.exs

@@ -150,23 +150,26 @@ defmodule Kernel.QuoteTest do
     assert { :->, _, [{[], _, 1}] } = (quote do: (-> 1))
   end
 
-  defmacrop dynamic_opts do
-    [line: 3]
-  end
-
-  test :quote_with_dynamic_opts do
-    assert quote(dynamic_opts, do: bar(1, 2, 3)) == { :bar, [line: 3], [1, 2, 3] }
-  end
-
   test :bind_quoted do
     assert quote(bind_quoted: [foo: 1 + 2], do: foo) == { :__block__, [], [
       { :=, [], [{ :foo, [], Kernel.QuoteTest }, 3] },
       { :foo, [], Kernel.QuoteTest }
     ] }
   end
 
-  test :quote_with_list_block do
+  test :literals do
+    assert (quote do: []) == []
+    assert (quote do: nil) == nil
     assert (quote do [] end) == []
+    assert (quote do nil end) == nil
+  end
+
+  defmacrop dynamic_opts do
+    [line: 3]
+  end
+
+  test :with_dynamic_opts do
+    assert quote(dynamic_opts, do: bar(1, 2, 3)) == { :bar, [line: 3], [1, 2, 3] }
   end
 end