Avoid implicit conversion from int to char

googletest/src/gtest-printers.cc

@@ -315,7 +315,7 @@ void PrintTo(__uint128_t v, ::std::ostream* os) {
     low = low / 10 + high_mod * 1844674407370955161 + carry / 10;
 
     char digit = static_cast<char>(carry % 10);
-    *--p = '0' + digit;
+    *--p = static_cast<char>('0' + digit);
   }
   *os << p;
 }