Save before system restart.

I am about to re-start my system, so I save before any crashes
happen.

1 files changed, 1 insertions, 1 deletions

diff --git a/graph/src/builder.rs b/graph/src/builder.rs
index 4a480a5..5505e4f 100644
--- a/graph/src/builder.rs
+++ b/graph/src/builder.rs
@@ -77,7 +77,7 @@ pub trait BuilderMut {
     fn from_graph_mut(graph: &mut Self::Graph) -> Self::ResultBuilder<'_>;
 
     /// Add a new vertex.
-    fn add_vertex(&mut self, label: Self::Label) -> Result<usize, Error>;
+    fn add_vertex(&mut self, label: Self::Label) -> usize;
 
     /// Add an edge from the source to the target.
     fn add_edge(&mut self, source: usize, target: usize, label: Self::Label) -> Result<(), Error>;