v1.7.2

FIXED:
* multierr race condition fix/now fully supports multithreading

multierr/funcs.go

@@ -69,6 +69,9 @@ func (e *MultiError) Error() (errStr string) {
 		numErrs = len(e.Errors)
 	}
 
+	e.lock.Lock()
+	defer e.lock.Unlock()
+
 	for idx, err := range e.Errors {
 		if (idx + 1) < numErrs {
 			errStr += fmt.Sprintf("%v%v", err.Error(), e.ErrorSep)
@@ -87,6 +90,9 @@ func (e *MultiError) AddError(err error) {
 		return
 	}
 
+	e.lock.Lock()
+	defer e.lock.Unlock()
+
 	e.Errors = append(e.Errors, err)
 
 }

multierr/types.go

@@ -1,9 +1,14 @@
 package multierr
 
+import (
+	`sync`
+)
+
 // MultiError is a type of error.Error that can contain multiple errors.
 type MultiError struct {
 	// Errors is a slice of errors to combine/concatenate when .Error() is called.
 	Errors []error `json:"errors"`
 	// ErrorSep is a string to use to separate errors for .Error(). The default is "\n".
 	ErrorSep string `json:"separator"`
+	lock sync.Mutex
 }