From ec6b89ea1104a5bddf289bb214657e9dee25463d Mon Sep 17 00:00:00 2001
From: Jeremie Dimino <jdimino@janestreet.com>
Date: Wed, 15 Mar 2017 09:46:42 +0000
Subject: [PATCH] Improve errors for ${lib:...}

---
 src/artifacts.ml | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/artifacts.ml b/src/artifacts.ml
index 6d67757e..1e0c467b 100644
--- a/src/artifacts.ml
+++ b/src/artifacts.ml
@@ -87,7 +87,8 @@ let file_of_lib ?(use_provides=false) t ~from ~lib ~file =
       | None ->
         Error
           { fail = fun () ->
-              die
-                "Library %s not found in the tree or in the installed world"
-                lib
+              ignore (Findlib.find_exn t.context.findlib lib
+                        ~required_by:[Utils.jbuild_name_in ~dir:from]
+                      : Findlib.package);
+              assert false
           }