commit 79c9d15c14a898e1ae2085f265a5396b190d7017
author martinsimpson <martinsimpson@google.com> Tue Oct 29 10:11:34 2019 -0700
committer David P. Baker <dpb@google.com> Wed Oct 30 09:46:43 2019 -0400
tree 22b031c8f2314e8366c7af35f1d1d408274248f5
parent 6c2c1a3ff8d2abc74755dfe18c07fa60ee1c7733

Improved AutoFactory error message

RELNOTES=Better error message for failed factory write.

One known cause of this error is using an impl class name that is the same
as the declared interface (in which case this new message will tell you
that you are attempting to recreate an existing file name).

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=277308587

factory/src/main/java/com/google/auto/factory/processor/AutoFactoryProcessor.java

diff --git a/factory/src/main/java/com/google/auto/factory/processor/AutoFactoryProcessor.java b/factory/src/main/java/com/google/auto/factory/processor/AutoFactoryProcessor.java
index 7c84249..cf3d5eb 100644
--- a/factory/src/main/java/com/google/auto/factory/processor/AutoFactoryProcessor.java
+++ b/factory/src/main/java/com/google/auto/factory/processor/AutoFactoryProcessor.java
@@ -175,7 +175,7 @@
                   implementationMethodDescriptors.get(entry.getKey()),
                   allowSubclasses));
         } catch (IOException e) {
-          messager.printMessage(Kind.ERROR, "failed");
+          messager.printMessage(Kind.ERROR, "failed: " + e);
         }
       }
     }