rust: alloc: add doc test for Vec::extend_with

Add a doc test for `Vec::extend_with` demonstrating basic usage and the
zero-length case.

Signed-off-by: Hsiu Che Yu <yu.whisper.personal@gmail.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/a02bc604cde78ba505441a5555400e6f575e8a8a.1777111268.git.yu.whisper.personal@gmail.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Hsiu Che Yu 2026-04-25 18:16:18 +08:00 • committed by Danilo Krummrich
commit 802ca0008b