Replaced Errors interface with concrete type Errors.

README.md

@@ -35,12 +35,11 @@ function Open(p string) (*File, error) {
 
 **Errors**
 
-An `Errors` interface that represents multiple errors (but still adheres to the `error` interface)
+An `Errors` struct that represents multiple errors (but still adheres to the `error` interface)
 
 ```
-type Errors interface {
-    error
-    Errs() []error
+type Errors struct {
+	Errs []error
 }
 ```
 

deopter_test.go

@@ -66,8 +66,8 @@ func TestDeopterMultipleErrors(t *testing.T) {
 	var err = d.Invoke()
 
 	assert.NotNil(t, err)
-	require.Implements(t, (*Errors)(nil), err)
-	var errs = err.(Errors).Errs()
+	require.IsType(t, &Errors{}, err)
+	var errs = err.(*Errors).Errs
 	require.Equal(t, 2, len(errs))
 	assert.True(t, o1.exec)
 	assert.True(t, o2.exec)

errors.go

@@ -5,24 +5,17 @@ import (
 	"fmt"
 )
 
-var _ Errors = errorAggregate{}
+var _ error = &Errors{}
 
 // Errors exposes slice of errors.
-type Errors interface {
-	error
-	Errs() []error
+type Errors struct {
+	Errs []error
 }
 
-type errorAggregate []error
-
-func (e errorAggregate) Errs() []error {
-	return e
-}
-
-func (e errorAggregate) Error() string {
+func (e Errors) Error() string {
 	var msg = &bytes.Buffer{}
 	fmt.Fprint(msg, "errors: ")
-	for i, err := range e {
+	for i, err := range e.Errs {
 		if 0 < i {
 			fmt.Fprint(msg, "; ")
 		}
@@ -33,9 +26,9 @@ func (e errorAggregate) Error() string {
 
 // ErrCombine combines one or more errors, nil entries are omitted and nil is returned if all given errors are nil. The first argument is expanded if it satisfies the Errors interface. In case of aggregation of errors the return error will satisfy the Errors interface.
 func ErrCombine(errs ...error) error {
-	if 0 < len(errs) {
-		if e, ok := errs[0].(Errors); ok {
-			errs = append(e.Errs(), errs[1:]...)
+	if len(errs) > 0 {
+		if e, ok := errs[0].(*Errors); ok {
+			errs = append(e.Errs, errs[1:]...)
 		}
 	}
 	for i := 0; i < len(errs); i++ {
@@ -50,5 +43,7 @@ func ErrCombine(errs ...error) error {
 	} else if 1 == len(errs) {
 		return errs[0]
 	}
-	return errorAggregate(errs)
+	return &Errors{
+		Errs: errs,
+	}
 }

errors_test.go

@@ -35,8 +35,8 @@ func TestErrCombineAggregates(t *testing.T) {
 	var err = ErrCombine(err1, err2)
 
 	assert.NotNil(t, err)
-	require.Implements(t, (*Errors)(nil), err)
-	var errs = err.(Errors).Errs()
+	require.IsType(t, &Errors{}, err)
+	var errs = err.(*Errors).Errs
 	assert.Equal(t, 2, len(errs))
 	assert.Equal(t, err1, errs[0])
 	assert.Equal(t, err2, errs[1])
@@ -60,8 +60,8 @@ func TestErrCombineExpandsFirstArgument(t *testing.T) {
 	var err = ErrCombine(ErrCombine(err1, err2), err3)
 
 	assert.NotNil(t, err)
-	require.Implements(t, (*Errors)(nil), err)
-	var errs = err.(Errors).Errs()
+	require.IsType(t, &Errors{}, err)
+	var errs = err.(*Errors).Errs
 	assert.Equal(t, 3, len(errs))
 	assert.Equal(t, err1, errs[0])
 	assert.Equal(t, err2, errs[1])
@@ -76,9 +76,9 @@ func TestErrCombineDoesNotExpandConsecutiveArguments(t *testing.T) {
 	var err = ErrCombine(err1, ErrCombine(err2, err3))
 
 	assert.NotNil(t, err)
-	require.Implements(t, (*Errors)(nil), err)
-	var errs = err.(Errors).Errs()
+	require.IsType(t, &Errors{}, err)
+	var errs = err.(*Errors).Errs
 	assert.Equal(t, 2, len(errs))
 	assert.Equal(t, err1, errs[0])
-	assert.Implements(t, (*Errors)(nil), errs[1])
+	assert.IsType(t, &Errors{}, errs[1])
 }