From dbc4aa749f934411b64c22adcd62439e54b57f7a Mon Sep 17 00:00:00 2001
From: Jin <jin@users.noreply.github.com>
Date: Mon, 15 Apr 2019 21:31:23 -0400
Subject: [PATCH] Add a else clause to generate_imports to guide users to open
 an issue (#109)

---
 coursier.bzl | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/coursier.bzl b/coursier.bzl
index e29a2ef86..a4cfcbbec 100644
--- a/coursier.bzl
+++ b/coursier.bzl
@@ -330,6 +330,18 @@ Parsed artifact data: {parsed_artifact}""".format(
             )
 
             fail(error_message)
+        else:
+            error_message = """Unable to generate a target for this artifact.
+
+Please file an issue on https://github.com/bazelbuild/rules_jvm_external/issues/new
+and include the following snippet:
+
+Artifact coordinates: {artifact}
+Parsed data: {parsed_artifact}""".format(
+                artifact = artifact["coord"],
+                parsed_artifact = repr(artifact)
+            )
+            fail(error_message)
 
     return "\n".join(all_imports)