style: no "this" or "self" as receiver

pkg/lambda/expression.go

@@ -12,12 +12,12 @@ type Abstraction struct {
 	Body      Expression
 }
 
-func (this *Abstraction) Copy() Expression {
-	return NewAbstraction(this.Parameter, this.Body.Copy())
+func (a *Abstraction) Copy() Expression {
+	return NewAbstraction(a.Parameter, a.Body.Copy())
 }
 
-func (this *Abstraction) Accept(v Visitor) {
-	v.VisitAbstraction(this)
+func (a *Abstraction) Accept(v Visitor) {
+	v.VisitAbstraction(a)
 }
 
 func NewAbstraction(parameter string, body Expression) *Abstraction {
@@ -31,12 +31,12 @@ type Application struct {
 	Argument    Expression
 }
 
-func (this *Application) Copy() Expression {
-	return NewApplication(this.Abstraction.Copy(), this.Argument.Copy())
+func (a *Application) Copy() Expression {
+	return NewApplication(a.Abstraction.Copy(), a.Argument.Copy())
 }
 
-func (this *Application) Accept(v Visitor) {
-	v.VisitApplication(this)
+func (a *Application) Accept(v Visitor) {
+	v.VisitApplication(a)
 }
 
 func NewApplication(function Expression, argument Expression) *Application {
@@ -49,12 +49,12 @@ type Variable struct {
 	Value string
 }
 
-func (this *Variable) Copy() Expression {
-	return NewVariable(this.Value)
+func (v *Variable) Copy() Expression {
+	return NewVariable(v.Value)
 }
 
-func (this *Variable) Accept(v Visitor) {
-	v.VisitVariable(this)
+func (v *Variable) Accept(visitor Visitor) {
+	visitor.VisitVariable(v)
 }
 
 func NewVariable(name string) *Variable {