2 files changed, 17 insertions, 1 deletions
diff --git a/build_extra/flatbuffers/rust/BUILD.gn b/build_extra/flatbuffers/rust/BUILD.gn
index dd4a5c64c..d983a175d 100644
--- a/build_extra/flatbuffers/rust/BUILD.gn
+++ b/build_extra/flatbuffers/rust/BUILD.gn
@@ -2,5 +2,5 @@ import("//build_extra/rust/rust.gni")
 
 rust_crate("flatbuffers") {
   source_root = "//third_party/flatbuffers/rust/flatbuffers/src/lib.rs"
-  args = [ "-Aunused_variables" ]  # TODO Remove this.
+  extern = [ "//build_extra/rust:smallvec" ]
 }
diff --git a/build_extra/rust/BUILD.gn b/build_extra/rust/BUILD.gn
index 382f9a90b..f75b96301 100644
--- a/build_extra/rust/BUILD.gn
+++ b/build_extra/rust/BUILD.gn
@@ -808,3 +808,19 @@ rust_crate("scoped_tls") {
     ":untrusted",
   ]
 }
+
+rust_crate("smallvec") {
+  source_root = "$registry_github/smallvec-0.6.5/lib.rs"
+  extern = [ ":unreachable" ]
+  features = [ "std" ]
+}
+
+rust_crate("unreachable") {
+  source_root = "$registry_github/unreachable-1.0.0/src/lib.rs"
+  extern = [ ":void" ]
+}
+
+rust_crate("void") {
+  source_root = "$registry_github/void-1.0.2/src/lib.rs"
+  features = [ "default" ]
+}