Add platform/external/rust/crates/proc-macro2
diff --git a/default.xml b/default.xml
index c68f46d..1072c03 100644
--- a/default.xml
+++ b/default.xml
@@ -713,6 +713,7 @@
   <project name="platform/external/rootdev" />
   <project name="platform/external/rust/crates/byteorder" />
   <project name="platform/external/rust/crates/libc" />
+  <project name="platform/external/rust/crates/proc-macro2" />
   <project name="platform/external/rust/crates/quote" />
   <project name="platform/external/rust/crates/remain" />
   <project name="platform/external/rust/crates/syn" />