lib.rs

				// This cannot underflow since `gas_spent` is never greater than `T::BlockGasLimit`.
				let gas_available = T::BlockGasLimit::get() - <Module<T>>::gas_spent();
				if *gas_limit > gas_available {
					// gas limit reached, revert the transaction and retry again in the future
					InvalidTransaction::ExhaustsResources.into()
				} else {
					Ok(ValidTransaction::default())
				}
			},
			Call::__PhantomItem(_, _)  => unreachable!("Variant is never constructed"),
		}
	}
}