tree 63b0d2ea5be317c5bf7747befb7d84e4383f9ebb
parent 0bcd37bd2b83f1a9ee17088037ebdfe6eab6d31a
author Aaron Wood <aaronwood@google.com> 1660169334 -0700
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1661568691 +0000

[rust-project.json] List the Rust sysroot if there is one and only one

List the path to the sysroot using the new 'sysroot' field added by
rust-analyzer if there is one and only one sysroot defined for the
project.

This enables rust-analyzer to find the compiler and tools vendored with
the compiler, such a proc-macro server that matches the compiler's ABI.

Change-Id: I92146a4afbed001e44d7a1b824bad536eb297841
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/14360
Reviewed-by: Tyler Mandry <tmandry@google.com>
Commit-Queue: Tyler Mandry <tmandry@google.com>
Reviewed-by: Brett Wilson <brettw@chromium.org>