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/credentials.go b/credentials.go
index deb399a..843c6b2 100644
--- a/credentials.go
+++ b/credentials.go
@@ -79,6 +79,7 @@ func (t CredentialType) String() string {
 }
 
 type Credential struct {
+	doNotCompare
 	ptr *C.git_credential
 }