From 4f9c7aedc735a01ceb7ae3fd857e948c8ace3e1d Mon Sep 17 00:00:00 2001
From: Gleb Mazovetskiy <glex.spb@gmail.com>
Date: Fri, 12 Apr 2019 04:39:14 +0100
Subject: [PATCH] Fix incorrect call to `std::isdigit`

This caused the Win32 Debug build to crash.

See https://en.cppreference.com/w/cpp/string/byte/isdigit for more
information.

Refs #2867
---
 src/prelexer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/prelexer.cpp b/src/prelexer.cpp
index 2f05a896e..c8dbe34c1 100644
--- a/src/prelexer.cpp
+++ b/src/prelexer.cpp
@@ -1400,7 +1400,7 @@ namespace Sass {
     }*/
 
     const char* H(const char* src) {
-      return std::isxdigit(*src) ? src+1 : 0;
+      return std::isxdigit(static_cast<unsigned char>(*src)) ? src+1 : 0;
     }
 
     const char* W(const char* src) {