From 1e23b4ddf4d2dfbf9fa860e8f54fa18fac6b8556 Mon Sep 17 00:00:00 2001
From: Nick Schonning <nschonni@gmail.com>
Date: Thu, 18 Jul 2019 01:42:57 -0400
Subject: [PATCH] fix: Error on non-int str-insert index

See https://github.com/sass/sass-spec/pull/1439
Closes #2921
---
 src/fn_strings.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/fn_strings.cpp b/src/fn_strings.cpp
index b09fce9a6..d6adecbf1 100644
--- a/src/fn_strings.cpp
+++ b/src/fn_strings.cpp
@@ -99,6 +99,9 @@ namespace Sass {
         String_Constant* i = ARG("$insert", String_Constant);
         std::string ins = i->value();
         double index = ARGVAL("$index");
+        if (index != (int)index) {
+          error("$index: " + std::to_string(index) + " is not an int", pstate, traces);
+        }
         size_t len = UTF_8::code_point_count(str, 0, str.size());
 
         if (index > 0 && index <= len) {