\d is a printable character

Author: José Valim

lib/elixir/lib/inspect.ex

@@ -142,7 +142,7 @@ end
 defimpl Inspect, for: BitString do
   def inspect(thing, %Inspect.Opts{binaries: bins} = opts) when is_binary(thing) do
     if bins == :as_strings or (bins == :infer and String.printable?(thing)) do
-      << ?", escape(thing, ?") :: binary, ?" >>
+      <<?", escape(thing, ?") :: binary, ?">>
     else
       inspect_bitstring(thing, opts)
     end

lib/elixir/lib/string.ex

@@ -143,6 +143,7 @@ defmodule String do
   def printable?(<<?\b, t :: binary>>), do: printable?(t)
   def printable?(<<?\f, t :: binary>>), do: printable?(t)
   def printable?(<<?\e, t :: binary>>), do: printable?(t)
+  def printable?(<<?\d, t :: binary>>), do: printable?(t)
   def printable?(<<?\a, t :: binary>>), do: printable?(t)
 
   def printable?(<<>>), do: true

lib/elixir/test/elixir/inspect_test.exs

@@ -86,6 +86,11 @@ defmodule Inspect.BitStringTest do
     assert inspect(" ゆんゆん") == "\" ゆんゆん\""
   end
 
+  test :all_escapes do
+    assert inspect("\a\b\d\e\f\n\r\s\t\v") ==
+           "\"\\a\\b\\d\\e\\f\\n\\r \\t\\v\""
+  end
+
   test :opt_infer do
     assert inspect(<<"eric", 193, "mj">>, binaries: :infer) == ~s(<<101, 114, 105, 99, 193, 109, 106>>)
     assert inspect(<<"eric">>, binaries: :infer) == ~s("eric")