From eebfae7bb0accd1ee90ef8349362ced0e7452ddd Mon Sep 17 00:00:00 2001
From: Michael Rogenmoser <michael@rogenmoser.us>
Date: Fri, 10 May 2024 18:59:56 +0200
Subject: [PATCH] Fix dependency mismatch panic

---
 src/sess.rs | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/sess.rs b/src/sess.rs
index 013e84d9..9cbf4dc7 100644
--- a/src/sess.rs
+++ b/src/sess.rs
@@ -179,8 +179,25 @@ impl<'sess, 'ctx: 'sess> Session<'ctx> {
         // Translate the name-based graph into an ID-based graph.
         let graph: IndexMap<DependencyRef, IndexSet<DependencyRef>> = graph_names
             .into_iter()
-            .map(|(k, v)| (k, v.iter().map(|name| names[name]).collect()))
-            .collect();
+            .map(|(k, v)| {
+                (
+                    k,
+                    v.iter()
+                        .map(|name| match names.get(name) {
+                            Some(id) => Ok(*id),
+                            None => Err(Error::new(format!(
+                                "Failed to match dependency {}, please run `bender update`!",
+                                name
+                            ))),
+                        })
+                        .collect::<Result<_>>(),
+                )
+            })
+            .map(|(k, v)| match v {
+                Ok(v) => Ok((k, v)),
+                Err(e) => Err(e),
+            })
+            .collect::<Result<_>>()?;
 
         // Determine the topological ordering of the packages.
         let pkgs = {