Inline Map.from_keys/2

Author: devinus

lib/elixir/lib/map.ex

@@ -128,6 +128,8 @@ defmodule Map do
   @doc """
   Builds a map from the given `keys` and the fixed `value`.
 
+  Inlined by the compiler.
+
   ## Examples
 
       iex> Map.from_keys([1, 2, 3], :number)
@@ -136,9 +138,7 @@ defmodule Map do
   """
   @doc since: "1.14.0"
   @spec from_keys([key], value) :: map
-  def from_keys(keys, value) do
-    :maps.from_keys(keys, value)
-  end
+  defdelegate from_keys(keys, value), to: :maps
 
   @doc """
   Returns all keys from `map`.

lib/elixir/src/elixir_rewrite.erl

@@ -148,6 +148,7 @@ inline(Mod, Fun, Arity) -> inner_inline(ex_to_erl, Mod, Fun, Arity).
 ?inline(?list, to_integer, 2, erlang, list_to_integer);
 ?inline(?list, to_tuple, 1, erlang, list_to_tuple);
 
+?inline(?map, from_keys, 2, maps, from_keys);
 ?inline(?map, intersect, 2, maps, intersect);
 ?inline(?map, keys, 1, maps, keys);
 ?inline(?map, merge, 2, maps, merge);