[DNM] temporarily make nontrivial raw conversion an error

Author: atrick

include/swift/AST/DiagnosticsSIL.def

@@ -808,14 +808,14 @@ ERROR(sil_movekillscopyablevalue_move_applied_to_unsupported_move, none,
       ())
 
 // Implicit inout-to-UnsafeRawPointer conversions
-WARNING(nontrivial_to_rawpointer_conversion,none,
-        "cannot implicitly convert an inout value of type %0 to expected "
-        "argument type %1 because %2 may contain an object reference.",
-        (Type, Type, Type))
-
-WARNING(nontrivial_string_to_rawpointer_conversion,none,
-        "cannot implicitly convert an inout String to expected argument type %0.",
-        (Type))
+ERROR(nontrivial_to_rawpointer_conversion,none,
+      "cannot implicitly convert an inout value of type %0 to expected "
+      "argument type %1 because %2 may contain an object reference.",
+      (Type, Type, Type))
+
+ERROR(nontrivial_string_to_rawpointer_conversion,none,
+      "cannot implicitly convert an inout String to expected argument type %0.",
+      (Type))
 
 #define UNDEFINE_DIAGNOSTIC_MACROS
 #include "DefineDiagnosticMacros.h"