tree 726542adcf47e294fd7bffc8030f79f605b56a75
parent b8562a4abd9528372f274b1155aec65c57ca84fa
author Takuto Ikuta <tikuta@google.com> 1705371462 +0900
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1705401345 +0000

add forward declaration in rust_values.h

Target class is referenced, but header is not included.
This is to fix
http://ci.chromium.org/b/8758787771688889681
for
https://gn-review.git.corp.google.com/c/gn/+/16440/2

Change-Id: I0b516a4c8d8cb845951acc77b03664f11f91a8d1
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/16460
Reviewed-by: David Turner <digit@google.com>
Commit-Queue: David Turner <digit@google.com>