// $ cargo bench --features full --bench file

#![feature(rustc_private, test)]
#![recursion_limit = "1024"]
#![allow(clippy::missing_panics_doc, clippy::must_use_candidate)]

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/library/core/src/str/mod.rs";

fn get_tokens() -> TokenStream {
    repo::clone_rust();
    let content = fs::read_to_string(FILE).unwrap();
    TokenStream::from_str(&content).unwrap()
}

#[bench]
fn baseline(b: &mut Bencher) {
    let tokens = get_tokens();
    b.iter(|| drop(tokens.clone()));
}

#[bench]
fn parse_file(b: &mut Bencher) {
    let tokens = get_tokens();
    b.iter(|| syn::parse2::<syn::File>(tokens.clone()));
}

// $ cargo bench --features full --bench file

#![feature(rustc_private, test)]
#![recursion_limit = "1024"]
#![allow(clippy::missing_panics_doc, clippy::must_use_candidate)]

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/library/core/src/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()));
}

--- 
+++ 
@@ -22,10 +22,20 @@
 
 const FILE: &str = "tests/rust/library/core/src/str/mod.rs";
 
+fn get_tokens() -> TokenStream {
+    repo::clone_rust();
+    let content = fs::read_to_string(FILE).unwrap();
+    TokenStream::from_str(&content).unwrap()
+}
+
+#[bench]
+fn baseline(b: &mut Bencher) {
+    let tokens = get_tokens();
+    b.iter(|| drop(tokens.clone()));
+}
+
 #[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();
+    let tokens = get_tokens();
     b.iter(|| syn::parse2::<syn::File>(tokens.clone()));
 }
Add baseline benchmark to distinguish TokenStream::clone from syn::parse2
