syn example

example/syn/.gitignore

+Cargo.lock
\ No newline at end of file

example/syn/Cargo.toml

+# Cargo.toml
+
+[package]
+name = "test-syn"
+version = "0.0.1"
+
+[dependencies.syn]
+git = "https://github.com/dtolnay/syn"
+features = ["parsing", "full"]
+
+[[bin]]
+name = "parse_file"
+path = "parse_file.rs"

example/syn/README.md

+Make sure you have cargo-seer installed:
+
+```
+cargo install seer --git https://github.com/dwrensha/seer
+```
+
+Then run seer in this directory, with:
+
+```
+RUSTFLAGS="-Z always-encode-mir" CFG_COMPILER_HOST_TRIPLE=x86_64-unknown-linux-gnu XARGO_RUST_SRC=/path/to/rust/repo/src xargo seer --target x86_64-unknown-linux-gnu
+```
+
+See https://github.com/japaric/xargo/issues/125#issuecomment-328300943 for more discussion about
+why all these special options are needed.
\ No newline at end of file

example/syn/Xargo.toml

+# Xargo.toml
+
+[dependencies]
+std = {features = ["panic_unwind", "jemalloc"]}
+
+[target.x86_64-unknown-linux-gnu.dependencies.term]
+stage=1
+
+[target.x86_64-unknown-linux-gnu.dependencies.proc_macro]
+stage=2
\ No newline at end of file

example/syn/parse_file.rs

+extern crate syn;
+
+fn main() {
+    use std::io::Read;
+    let mut data: Vec<u8> = vec![0; 12];
+    let mut stdin = ::std::io::stdin();
+    stdin.read_exact(&mut data[..]).unwrap();
+
+    for idx in 0..data.len() {
+        if data[idx] > 127 {
+            return; // avoid invalid utf8 by exiting early
+        }
+    }
+
+    let mut buf = String::new();
+    {
+        let buf_bytes = unsafe { buf.as_mut_vec() };
+        for idx in 0..data.len() {
+            buf_bytes.push(data[idx]);
+        }
+    }
+
+    let _ = syn::parse_file(&buf);
+}