1 files changed, 30 insertions, 0 deletions
diff --git a/third_party/rust/syn/benches/file.rs b/third_party/rust/syn/benches/file.rs
new file mode 100644
index 0000000000..58ab8df297
--- /dev/null
+++ b/third_party/rust/syn/benches/file.rs
@@ -0,0 +1,30 @@
+// $ cargo bench --features full --bench file
+
+#![feature(rustc_private, test)]
+#![recursion_limit = "1024"]
+
+extern crate test;
+
+#[macro_use]
+#[path = "../tests/macros/mod.rs"]
+mod macros;
+
+#[path = "../tests/common/mod.rs"]
+mod common;
+#[path = "../tests/repo/mod.rs"]
+pub mod repo;
+
+use proc_macro2::TokenStream;
+use std::fs;
+use std::str::FromStr;
+use test::Bencher;
+
+const FILE: &str = "tests/rust/src/libcore/str/mod.rs";
+
+#[bench]
+fn parse_file(b: &mut Bencher) {
+    repo::clone_rust();
+    let content = fs::read_to_string(FILE).unwrap();
+    let tokens = TokenStream::from_str(&content).unwrap();
+    b.iter(|| syn::parse2::<syn::File>(tokens.clone()));
+}