message: Add additional info to exception
diff: @@ -63,10 +63,10 @@ namespace eosio {
  static constexpr uint8_t max_precision = 18;
  explicit symbol(uint8_t p, const char* s): m_value(string_to_symbol(p, s)) {
  - FC_ASSERT(valid(), "invalid symbol");
  + FC_ASSERT(valid(), "invalid symbol", ("s",s));
  }
  explicit symbol(uint64_t v = SY(4, EOS)): m_value(v) {
  - FC_ASSERT(valid(), "invalid symbol");
  + FC_ASSERT(valid(), "invalid symbol", ("name",name()));
  }
  static symbol from_string(const string& from)
  {
  