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[PATCH v2 1/2] rebase doc: document rebase.useBuiltin

The rebase.useBuiltin variable introduced in 55071ea248 ("rebase:
start implementing it as a builtin", 2018-08-07) was turned on by
default in 5541bd5b8f ("rebase: default to using the builtin rebase",
2018-08-08), but had no documentation.

Let's document it so that users who run into any stability issues with
the C rewrite know there's an escape hatch[1], and make it clear that
needing to turn off builtin rebase means you've found a bug in git.

1. https://public-inbox.org/git/87y39w1wc2.fsf@xxxxxxxxxxxxxxxxxxx/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
 Documentation/config/rebase.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/config/rebase.txt b/Documentation/config/rebase.txt
index 42e1ba7575..f079bf6b7e 100644
--- a/Documentation/config/rebase.txt
+++ b/Documentation/config/rebase.txt
@@ -1,3 +1,17 @@
+	Set to `false` to use the legacy shellscript implementation of
+	linkgit:git-rebase[1]. Is `true` by default, which means use
+	the built-in rewrite of it in C.
+The C rewrite is first included with Git version 2.20. This option
+serves an an escape hatch to re-enable the legacy version in case any
+bugs are found in the rewrite. This option and the shellscript version
+of linkgit:git-rebase[1] will be removed in some future release.
+If you find some reason to set this option to `false` other than
+one-off testing you should report the behavior difference as a bug in
 	Whether to show a diffstat of what changed upstream since the last
 	rebase. False by default.