internal: fix megacheck warnings (#14919)

internal/ethapi/api.go

@@ -46,7 +46,6 @@ import (
 const (
 	defaultGas      = 90000
 	defaultGasPrice = 50 * params.Shannon
-	emptyHex        = "0x"
 )
 
 // PublicEthereumAPI provides an API to access Ethereum related information.
@@ -548,26 +547,6 @@ func (s *PublicBlockChainAPI) GetStorageAt(ctx context.Context, address common.A
 	return res[:], state.Error()
 }
 
-// callmsg is the message type used for call transitions.
-type callmsg struct {
-	addr          common.Address
-	to            *common.Address
-	gas, gasPrice *big.Int
-	value         *big.Int
-	data          []byte
-}
-
-// accessor boilerplate to implement core.Message
-func (m callmsg) From() (common.Address, error)         { return m.addr, nil }
-func (m callmsg) FromFrontier() (common.Address, error) { return m.addr, nil }
-func (m callmsg) Nonce() uint64                         { return 0 }
-func (m callmsg) CheckNonce() bool                      { return false }
-func (m callmsg) To() *common.Address                   { return m.to }
-func (m callmsg) GasPrice() *big.Int                    { return m.gasPrice }
-func (m callmsg) Gas() *big.Int                         { return m.gas }
-func (m callmsg) Value() *big.Int                       { return m.value }
-func (m callmsg) Data() []byte                          { return m.data }
-
 // CallArgs represents the arguments for a call.
 type CallArgs struct {
 	From     common.Address  `json:"from"`
@@ -626,10 +605,8 @@ func (s *PublicBlockChainAPI) doCall(ctx context.Context, args CallArgs, blockNr
 	// Wait for the context to be done and cancel the evm. Even if the
 	// EVM has finished, cancelling may be done (repeatedly)
 	go func() {
-		select {
-		case <-ctx.Done():
+		<-ctx.Done()
 		evm.Cancel()
-		}
 	}()
 
 	// Setup the gas pool (also for unmetered requests)
@@ -1306,7 +1283,7 @@ func (api *PublicDebugAPI) PrintBlock(ctx context.Context, number uint64) (strin
 	if block == nil {
 		return "", fmt.Errorf("block #%d not found", number)
 	}
-	return fmt.Sprintf("%s", block), nil
+	return block.String(), nil
 }
 
 // SeedHash retrieves the seed hash of a block.

internal/jsre/pretty.go

@@ -65,14 +65,6 @@ func prettyError(vm *otto.Otto, err error, w io.Writer) {
 	fmt.Fprint(w, ErrorColor("%s", failure))
 }
 
-// jsErrorString adds a backtrace to errors generated by otto.
-func jsErrorString(err error) string {
-	if ottoErr, ok := err.(*otto.Error); ok {
-		return ottoErr.String()
-	}
-	return err.Error()
-}
-
 func (re *JSRE) prettyPrintJS(call otto.FunctionCall) otto.Value {
 	for _, v := range call.ArgumentList {
 		prettyPrint(call.Otto, v, re.output)