--- 9422-orig.patch	2020-06-17 14:47:25.621380824 +0000
+++ 9422-works.patch	2020-06-17 20:54:58.536349516 +0000
@@ -205,20 +205,6 @@
  require "./std/weak_ref_spec.cr"
  require "./std/xml/builder_spec.cr"
  require "./std/xml/html_spec.cr"
-diff --git a/src/compiler/crystal/semantic/main_visitor.cr b/src/compiler/crystal/semantic/main_visitor.cr
-index a4cff837c39..c6b4ec4009c 100644
---- a/src/compiler/crystal/semantic/main_visitor.cr
-+++ b/src/compiler/crystal/semantic/main_visitor.cr
-@@ -2431,9 +2431,6 @@ module Crystal
-     end
- 
-     def visit_va_arg(node)
--      if program.has_flag? "windows"
--        node.raise "va_arg is not yet supported on Windows"
--      end
-       arg = call.not_nil!.args[0]? || node.raise("requires type argument")
-       node.type = arg.type.instance_type
-     end
 diff --git a/src/lib_c/aarch64-linux-gnu/c/stdarg.cr b/src/lib_c/aarch64-linux-gnu/c/stdarg.cr
 index 882d4f51d35..965355556d7 100644
 --- a/src/lib_c/aarch64-linux-gnu/c/stdarg.cr