Remove unused ReadNextError

msgp/errors.go

@@ -140,19 +140,3 @@ func (e *ErrUnsupportedType) Error() string { return fmt.Sprintf("msgp: type %q
 
 // Resumable returns 'true' for ErrUnsupportedType
 func (e *ErrUnsupportedType) Resumable() bool { return true }
-
-// ReadNextError is returned the buffer passed to ReadNext is not large enough.
-type ReadNextError struct {
-	Got    uintptr
-	Wanted uintptr
-}
-
-// Error implements the error interface
-func (err ReadNextError) Error() string {
-	return fmt.Sprintf("msgp: slice not big enough (%d < %d)",
-		err.Got, err.Wanted)
-}
-
-// Resumable is always 'false' for ReadNextError, since we may be inside a
-// recursive call which has already partially consumed the stream.
-func (err ReadNextError) Resumable() bool { return false }