consensus, core: drop all the legacy custom core error types

miner/worker.go

@@ -503,13 +503,13 @@ func (self *worker) commitNewWork() {
 func (self *worker) commitUncle(work *Work, uncle *types.Header) error {
 	hash := uncle.Hash()
 	if work.uncles.Has(hash) {
-		return core.UncleError("uncle not unique")
+		return fmt.Errorf("uncle not unique")
 	}
 	if !work.ancestors.Has(uncle.ParentHash) {
-		return core.UncleError(fmt.Sprintf("uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
+		return fmt.Errorf("uncle's parent unknown (%x)", uncle.ParentHash[0:4])
 	}
 	if work.family.Has(hash) {
-		return core.UncleError(fmt.Sprintf("uncle already in family (%x)", hash))
+		return fmt.Errorf("uncle already in family (%x)", hash)
 	}
 	work.uncles.Add(uncle.Hash())
 	return nil
@@ -554,23 +554,23 @@ func (env *Work) commitTransactions(mux *event.TypeMux, txs *types.TransactionsB
 		env.state.StartRecord(tx.Hash(), common.Hash{}, env.tcount)
 
 		err, logs := env.commitTransaction(tx, bc, gp)
-		switch {
-		case core.IsGasLimitErr(err):
+		switch err {
+		case core.ErrGasLimitReached:
 			// Pop the current out-of-gas transaction without shifting in the next from the account
 			log.Trace("Gas limit exceeded for current block", "sender", from)
 			txs.Pop()
 
-		case err != nil:
-			// Pop the current failed transaction without shifting in the next from the account
-			log.Trace("Transaction failed, will be removed", "hash", tx.Hash(), "err", err)
-			env.failedTxs = append(env.failedTxs, tx)
-			txs.Pop()
-
-		default:
+		case nil:
 			// Everything ok, collect the logs and shift in the next transaction from the same account
 			coalescedLogs = append(coalescedLogs, logs...)
 			env.tcount++
 			txs.Shift()
+
+		default:
+			// Pop the current failed transaction without shifting in the next from the account
+			log.Trace("Transaction failed, will be removed", "hash", tx.Hash(), "err", err)
+			env.failedTxs = append(env.failedTxs, tx)
+			txs.Pop()
 		}
 	}