Use triple underscore instead of double

test/blanks_test.exs

@@ -2,7 +2,7 @@ defmodule BlanksTest do
   use ExUnit.Case, async: true
 
   test "simple replacement" do
-    ast = quote do: 1 + __
+    ast = quote do: 1 + ___
 
     mangled = Blanks.replace(ast, 37)
     assert {:+, [context: BlanksTest, import: Kernel], [1, 37]} == mangled
@@ -29,25 +29,25 @@ defmodule BlanksTest do
   end
 
   test "complex example" do
-    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [true, {:__, [], __MODULE__}]}]}]
+    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [true, {:___, [], __MODULE__}]}]}]
 
     assert [do: {:assert, [line: 5], [{:==, [line: 5], [true, true]}]}] == Blanks.replace(ast, true)
   end
 
   test "multiple arguments" do
-    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [{:__, [], __MODULE__}, {:__, [], __MODULE__}]}]}]
+    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [{:___, [], __MODULE__}, {:___, [], __MODULE__}]}]}]
 
     assert [do: {:assert, [line: 5], [{:==, [line: 5], [true, false]}]}] == Blanks.replace(ast, [true, false])
   end
 
   test "counts simple blanks" do
-    ast = quote do: 1 + __
+    ast = quote do: 1 + ___
 
     assert Blanks.count(ast) == 1
   end
 
   test "counts multiple blanks" do
-    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [{:__, [], __MODULE__}, {:__, __MODULE__}]}]}]
+    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [{:___, [], __MODULE__}, {:___, __MODULE__}]}]}]
 
     assert Blanks.count(ast) == 2
   end

test/support/sample_koan.ex

@@ -2,7 +2,7 @@ defmodule SampleKoan do
   use Koans
 
   koan "Thinking more than once" do
-    assert 3 == :__
-    assert 4 == :__
+    assert 3 == ___
+    assert 4 == ___
   end
 end