From af96402cc88a40db4f61b22924bfeb24a53cf424 Mon Sep 17 00:00:00 2001
From: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Date: Tue, 17 Nov 2015 22:11:54 +0300
Subject: [PATCH] Add a future compatibility note

---
 src/librustc_typeck/check/_match.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/librustc_typeck/check/_match.rs b/src/librustc_typeck/check/_match.rs
index 7cc81027f024a..4e305e0f6f7d0 100644
--- a/src/librustc_typeck/check/_match.rs
+++ b/src/librustc_typeck/check/_match.rs
@@ -674,6 +674,10 @@ pub fn check_pat_enum<'a, 'tcx>(pcx: &pat_ctxt<'a, 'tcx>,
                 report_bad_struct_kind(is_special_case);
                 if !is_special_case {
                     return
+                } else {
+                    span_note!(tcx.sess, pat.span,
+                        "this warning will become a HARD ERROR in a future release. \
+                        See RFC 218 for details.");
                 }
             }
             (variant.fields