From d9eb88c8363537701713027149957b3b7c08b57e Mon Sep 17 00:00:00 2001
From: xzyfer <xzyfer@gmail.com>
Date: Mon, 26 Sep 2016 00:00:48 +1000
Subject: [PATCH] Don't apply unary operations on colors

Spec sass/sass-spec#930
Fixes #2140
---
 src/eval.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/eval.cpp b/src/eval.cpp
index 7df3953425..89927b8f4b 100644
--- a/src/eval.cpp
+++ b/src/eval.cpp
@@ -759,7 +759,13 @@ namespace Sass {
       if (operand->concrete_type() == Expression::NULL_VAL && dynamic_cast<Variable*>(u->operand())) {
         u->operand(SASS_MEMORY_NEW(ctx.mem, String_Quoted, u->pstate(), ""));
       }
-      else u->operand(operand);
+      // Never apply unary opertions on colors @see #2140
+      else if (operand->concrete_type() == Expression::COLOR) {
+        operand = u->operand();
+      }
+      else {
+        u->operand(operand);
+      }
       String_Constant* result = SASS_MEMORY_NEW(ctx.mem, String_Quoted,
                                                   u->pstate(),
                                                   u->inspect());