Fix for escape sequences in SMT2 scanner

src/parsers/smt2/smt2scanner.cpp

@@ -179,6 +179,14 @@ namespace smt2 {
                     return STRING_TOKEN;
                 }
             }
+            else if (c == '\\') {
+                next();
+                c = curr();
+                if (c == EOF)
+                    throw scanner_exception("unexpected end of string", m_line, m_spos);
+                if (c != '\\' && c != '\"')
+                    throw scanner_exception("invalid escape sequence", m_line, m_spos);
+            }
             m_string.push_back(c);
             next();
         }