Revert structs into export time dependencies

Author: josevalim

lib/elixir/src/elixir_lexical.erl

@@ -41,15 +41,8 @@ trace({require, Meta, Module, _Opts}, #{lexical_tracker := Pid}) ->
     _ -> ?tracker:add_export(Pid, Module)
   end,
   ok;
-trace({struct_expansion, Meta, Module, _Keys}, #{lexical_tracker := Pid} = E) ->
-  maybe
-    #{function := {_, _}} ?= E,
-    Operation = proplists:get_value(operation, Meta, unknown),
-    true ?= (Operation =:= match) orelse (Operation =:= update),
-    ?tracker:remote_dispatch(Pid, Module, runtime)
-  else
-    _ -> ?tracker:add_export(Pid, Module)
-  end,
+trace({struct_expansion, _Meta, Module, _Keys}, #{lexical_tracker := Pid}) ->
+  ?tracker:add_export(Pid, Module),
   ok;
 trace({alias_reference, _Meta, Module}, #{lexical_tracker := Pid} = E) ->
   case E of

lib/elixir/test/elixir/kernel/lexical_tracker_test.exs

@@ -433,7 +433,7 @@ defmodule Kernel.LexicalTrackerTest do
         """)
 
       refute URI in compile
-      refute URI in exports
+      assert URI in exports
       assert URI in runtime
     end
 

lib/mix/lib/mix/tasks/xref.ex

@@ -733,13 +733,7 @@ defmodule Mix.Tasks.Xref do
 
   defp require_mode(meta), do: if(meta[:from_macro], do: :compile, else: :export)
 
-  defp struct_mode(meta, %{function: function}) do
-    if function != nil and meta[:operation] in [:match, :update] do
-      :runtime
-    else
-      :export
-    end
-  end
+  defp struct_mode(_meta, _env), do: :export
 
   defp mode(%{function: nil}), do: :compile
   defp mode(_), do: :runtime

lib/mix/test/mix/tasks/xref_test.exs

@@ -258,7 +258,7 @@ defmodule Mix.Tasks.XrefTest do
       lib/b.ex:7: call A.macro/0 (compile)
       lib/b.ex:8: call A.fun/0 (runtime)
       lib/b.ex:9: struct A (export)
-      lib/b.ex:10: struct A (runtime)
+      lib/b.ex:10: struct A (export)
       lib/b.ex:11: struct A (export)
       """