=== applying patch ./estimate-largest-group.patch
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c
|index f1c78ffb65..2d91c17866 100644
|--- a/src/backend/utils/adt/selfuncs.c
|+++ b/src/backend/utils/adt/selfuncs.c
--------------------------
Patching file src/backend/utils/adt/selfuncs.c using Plan A...
Hunk #1 succeeded at 3424.
Hunk #2 succeeded at 3738.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/src/include/utils/selfuncs.h b/src/include/utils/selfuncs.h
|index 95e44280c4..976df7720f 100644
|--- a/src/include/utils/selfuncs.h
|+++ b/src/include/utils/selfuncs.h
--------------------------
Patching file src/include/utils/selfuncs.h using Plan A...
Hunk #1 succeeded at 209.
done