Mark inlined function call result as generated

lib/elixir/src/elixir_erl_pass.erl

@@ -628,7 +628,8 @@ translate_remote(Left, Right, Meta, Args, S) ->
         [TOne, TTwo] -> {{op, Ann, Right, TOne, TTwo}, SA}
       end;
     {inline_pure, Result} ->
-      translate(Result, Ann, S);
+      Generated = erl_anno:set_generated(true, Ann),
+      translate(Result, Generated, S);
     {inline_args, NewArgs} ->
       {TLeft, SL} = translate(Left, Ann, S),
       {TArgs, SA} = translate_args(NewArgs, Ann, SL),

lib/elixir/test/elixir/fixtures/dialyzer/opaque_inline.ex

@@ -0,0 +1,10 @@
+defmodule Dialyzer.OpaqueInline do
+  @spec bar(MapSet.t()) :: term()
+  def bar(set) do
+    set
+  end
+
+  def foo() do
+    bar(MapSet.new([1, 2, 3]))
+  end
+end

lib/elixir/test/elixir/kernel/dialyzer_test.exs

@@ -32,6 +32,7 @@ defmodule Kernel.DialyzerTest do
       :elixir_env,
       :elixir_erl_pass,
       :maps,
+      :sets,
       ArgumentError,
       Atom,
       Code,
@@ -45,6 +46,7 @@ defmodule Kernel.DialyzerTest do
       List,
       Macro,
       Macro.Env,
+      MapSet,
       Module,
       Protocol,
       String,
@@ -176,6 +178,11 @@ defmodule Kernel.DialyzerTest do
     assert_dialyze_no_warnings!(context)
   end
 
+  test "no warning on inlined calls returning opaque", context do
+    copy_beam!(context, Dialyzer.OpaqueInline)
+    assert_dialyze_no_warnings!(context)
+  end
+
   defp copy_beam!(context, module) do
     name = "#{module}.beam"
     File.cp!(Path.join(context.base_dir, name), Path.join(context.outdir, name))