Can't recycle `name` (size 2) to match `foo` (size 3).
Cannot add named vertices to a non-empty unnamed graph. Existing vertices will have `NA` names.
vertices() errors on duplicate attribute names Duplicate attribute name in `vertices()`: "name".
Duplicate attribute name in `vertices()`: "blop".
Duplicate attribute name in `vertices()`: "name".
Duplicate attribute names in `vertices()`: "foo" and "bar".
adding named vertices to non-empty unnamed graphs errors Cannot add named vertices to a non-empty unnamed graph. Existing vertices will have `NA` names.
Cannot add named vertices to a non-empty unnamed graph. Existing vertices will have `NA` names.
Cannot add named vertices to a non-empty unnamed graph. Existing vertices will have `NA` names.
Cannot add named vertices to a non-empty unnamed graph. Existing vertices will have `NA` names.
Cannot add named vertices to a non-empty unnamed graph. Existing vertices will have `NA` names.
Cannot add named vertices to a non-empty unnamed graph. Existing vertices will have `NA` names.