From 16365c120b48b7c84847cf97d813190bc9a92025 Mon Sep 17 00:00:00 2001
From: Marcel Greter <marcel.greter@ocbnet.ch>
Date: Mon, 7 Oct 2019 19:58:56 +0200
Subject: [PATCH] Fix compound extend warning

---
 src/expand.cpp | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/expand.cpp b/src/expand.cpp
index 1b9bf9158..f5789b423 100644
--- a/src/expand.cpp
+++ b/src/expand.cpp
@@ -681,10 +681,18 @@ namespace Sass {
 
           if (compound->length() != 1) {
 
-            std::cerr <<
-              "compound selectors may no longer be extended.\n"
-              "Consider `@extend ${compound.components.join(', ')}` instead.\n"
-              "See http://bit.ly/ExtendCompound for details.\n";
+            std::stringstream sels; bool addComma = false;
+            sels << "Compound selectors may no longer be extended.\n";
+            sels << "Consider `@extend ";
+            for (auto sel : compound->elements()) {
+              if (addComma) sels << ", ";
+              sels << sel->to_sass();
+              addComma = true;
+            }
+            sels << "` instead.\n";
+            sels << "See http://bit.ly/ExtendCompound for details.";
+
+            warning(sels.str(), compound->pstate());
 
             // Make this an error once deprecation is over
             for (SimpleSelectorObj simple : compound->elements()) {