Make all non-user-creatable structures non-comparable (#802)

This change makes all non-user-creatable structures non-comparable. This
makes it easier to add changes later that don't introduce breaking
changes from the go compatibility guarantees perspective.

This, of course, implies that this change _is_ a breaking change, but since
these structures are not intended to be created by users (or de-referenced),
it should be okay.

1 files changed, 1 insertions, 0 deletions

diff --git a/indexer.go b/indexer.go
index 601ac9c..53ac420 100644
--- a/indexer.go
+++ b/indexer.go
@@ -19,6 +19,7 @@ import (
 // Indexer can post-process packfiles and create an .idx file for efficient
 // lookup.
 type Indexer struct {
+	doNotCompare
 	ptr        *C.git_indexer
 	stats      C.git_transfer_progress
 	ccallbacks C.git_remote_callbacks