From 9b29cbe1ea94d4420d676ad43fddb9d8e346444b Mon Sep 17 00:00:00 2001
From: Brian Anderson <banderson@mozilla.com>
Date: Wed, 17 Jun 2015 11:31:43 -0700
Subject: [PATCH] Remove unused emit_feature_warn function

---
 src/libsyntax/feature_gate.rs | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index ea135c7a642e..0b9978f839de 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -430,18 +430,6 @@ pub fn emit_feature_err(diag: &SpanHandler, feature: &str, span: Span, explain:
                                   feature));
 }
 
-pub fn emit_feature_warn(diag: &SpanHandler, feature: &str, span: Span, explain: &str) {
-    diag.span_warn(span, explain);
-
-    // #23973: do not suggest `#![feature(...)]` if we are in beta/stable
-    if option_env!("CFG_DISABLE_UNSTABLE_FEATURES").is_some() { return; }
-    if diag.handler.can_emit_warnings {
-        diag.fileline_help(span, &format!("add #![feature({})] to the \
-                                       crate attributes to silence this warning",
-                                      feature));
-    }
-}
-
 pub const EXPLAIN_ASM: &'static str =
     "inline assembly is not stable enough for use and is subject to change";