accounts/abi: address marius's comment

accounts/abi/abi.go

@@ -172,7 +172,7 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 		case "fallback":
 			// New introduced function type in v0.6.0, check more detail
 			// here https://solidity.readthedocs.io/en/v0.6.0/contracts.html#fallback-function
-			if abi.Fallback.Fallback {
+			if abi.HasFallback() {
 				return errors.New("only single fallback is allowed")
 			}
 			abi.Fallback = Method{
@@ -182,7 +182,7 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 				// The `StateMutability` can only be payable or nonpayable,
 				// so the constant is always false.
 				StateMutability: field.StateMutability,
-				Fallback:        true,
+				IsFallback:      true,
 
 				// Fallback doesn't have any input or output
 				Inputs:  nil,
@@ -195,7 +195,7 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 		case "receive":
 			// New introduced function type in v0.6.0, check more detail
 			// here https://solidity.readthedocs.io/en/v0.6.0/contracts.html#fallback-function
-			if abi.Receive.Receive {
+			if abi.HasReceive() {
 				return errors.New("only single receive is allowed")
 			}
 			if field.StateMutability != "payable" {
@@ -208,7 +208,7 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 				// The `StateMutability` can only be payable, so constant
 				// is always true while payable is always false.
 				StateMutability: field.StateMutability,
-				Receive:         true,
+				IsReceive:       true,
 
 				// Receive doesn't have any input or output
 				Inputs:  nil,
@@ -260,3 +260,13 @@ func (abi *ABI) EventByID(topic common.Hash) (*Event, error) {
 	}
 	return nil, fmt.Errorf("no event with id: %#x", topic.Hex())
 }
+
+// HasFallback returns an indicator whether a fallback function is included.
+func (abi *ABI) HasFallback() bool {
+	return abi.Fallback.IsFallback
+}
+
+// HasReceive returns an indicator whether a receive function is included.
+func (abi *ABI) HasReceive() bool {
+	return abi.Receive.IsReceive
+}

accounts/abi/bind/bind.go

@@ -159,10 +159,10 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			events[original.Name] = &tmplEvent{Original: original, Normalized: normalized}
 		}
 		// Add two special fallback functions if they exist
-		if evmABI.Fallback.Fallback {
+		if evmABI.HasFallback() {
 			fallback = &tmplMethod{Original: evmABI.Fallback}
 		}
-		if evmABI.Receive.Receive {
+		if evmABI.HasReceive() {
 			receive = &tmplMethod{Original: evmABI.Receive}
 		}
 		// There is no easy way to pass arbitrary java objects to the Go side.
@@ -639,9 +639,9 @@ func formatMethod(method abi.Method, structs map[string]*tmplStruct) string {
 		state = state + " "
 	}
 	identity := fmt.Sprintf("function %v", method.RawName)
-	if method.Fallback {
+	if method.IsFallback {
 		identity = "fallback"
-	} else if method.Receive {
+	} else if method.IsReceive {
 		identity = "receive"
 	}
 	return fmt.Sprintf("%s(%v) %sreturns(%v)", identity, strings.Join(inputs, ", "), state, strings.Join(outputs, ", "))

accounts/abi/method.go

@@ -55,8 +55,8 @@ type Method struct {
 
 	// The following two flags indicates whether the method is a
 	// special fallback introduced in solidity v0.6.0
-	Fallback bool
-	Receive  bool
+	IsFallback bool
+	IsReceive  bool
 
 	Inputs  Arguments
 	Outputs Arguments
@@ -72,7 +72,7 @@ type Method struct {
 func (method Method) Sig() string {
 	// Short circuit if the method is special. Fallback
 	// and Receive don't have signature at all.
-	if method.Fallback || method.Receive {
+	if method.IsFallback || method.IsReceive {
 		return ""
 	}
 	types := make([]string, len(method.Inputs))
@@ -104,9 +104,9 @@ func (method Method) String() string {
 		state = state + " "
 	}
 	identity := fmt.Sprintf("function %v", method.RawName)
-	if method.Fallback {
+	if method.IsFallback {
 		identity = "fallback"
-	} else if method.Receive {
+	} else if method.IsReceive {
 		identity = "receive"
 	}
 	return fmt.Sprintf("%v(%v) %sreturns(%v)", identity, strings.Join(inputs, ", "), state, strings.Join(outputs, ", "))