chore(vendor): add anyhow crate

third_party/crates/syn-3.0.6/tests/test_unparenthesize.rs

@@ -0,0 +1,71 @@
+#![cfg(not(miri))]
+#![recursion_limit = "1024"]
+#![feature(rustc_private)]
+#![allow(
+    clippy::assert_is_empty,
+    clippy::elidable_lifetime_names,
+    clippy::manual_assert,
+    clippy::match_like_matches_macro,
+    clippy::needless_lifetimes,
+    clippy::uninlined_format_args
+)]
+
+use crate::common::visit::{AsIfPrinted, FlattenParens};
+use quote::ToTokens as _;
+use std::fs;
+use std::panic;
+use std::path::Path;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use syn::visit_mut::VisitMut as _;
+
+#[macro_use]
+mod macros;
+
+mod common;
+mod repo;
+
+#[test]
+fn test_unparenthesize() {
+    repo::rayon_init();
+    repo::clone_rust();
+
+    let failed = AtomicUsize::new(0);
+
+    repo::for_each_rust_file(|path| test(path, &failed));
+
+    let failed = failed.into_inner();
+    if failed > 0 {
+        panic!("{} failures", failed);
+    }
+}
+
+fn test(path: &Path, failed: &AtomicUsize) {
+    let content = fs::read_to_string(path).unwrap();
+
+    match panic::catch_unwind(|| -> syn::Result<()> {
+        let mut before = syn::parse_file(&content)?;
+        FlattenParens::discard_attrs().visit_file_mut(&mut before);
+        let printed = before.to_token_stream();
+        let mut after = syn::parse2::<syn::File>(printed.clone())?;
+        FlattenParens::discard_attrs().visit_file_mut(&mut after);
+        // Normalize features that we expect Syn not to print.
+        AsIfPrinted.visit_file_mut(&mut before);
+        if before != after {
+            errorf!("=== {}\n", path.display());
+            if failed.fetch_add(1, Ordering::Relaxed) == 0 {
+                errorf!("BEFORE:\n{:#?}\nAFTER:\n{:#?}\n", before, after);
+            }
+        }
+        Ok(())
+    }) {
+        Err(_) => {
+            errorf!("=== {}: syn panic\n", path.display());
+            failed.fetch_add(1, Ordering::Relaxed);
+        }
+        Ok(Err(msg)) => {
+            errorf!("=== {}: syn failed to parse\n{:?}\n", path.display(), msg);
+            failed.fetch_add(1, Ordering::Relaxed);
+        }
+        Ok(Ok(())) => {}
+    }
+}