1 files changed, 135 insertions, 0 deletions
diff --git a/third_party/rust/syn/tests/repo/mod.rs b/third_party/rust/syn/tests/repo/mod.rs
new file mode 100644
index 0000000000..1d3e1f0e74
--- /dev/null
+++ b/third_party/rust/syn/tests/repo/mod.rs
@@ -0,0 +1,135 @@
+mod progress;
+
+use self::progress::Progress;
+use anyhow::Result;
+use flate2::read::GzDecoder;
+use std::fs;
+use std::path::Path;
+use tar::Archive;
+use walkdir::DirEntry;
+
+const REVISION: &str = "792c645ca7d11a8d254df307d019c5bf01445c37";
+
+#[rustfmt::skip]
+static EXCLUDE: &[&str] = &[
+    // Compile-fail expr parameter in const generic position: f::<1 + 2>()
+    "test/ui/const-generics/const-expression-parameter.rs",
+
+    // Deprecated anonymous parameter syntax in traits
+    "test/ui/issues/issue-13105.rs",
+    "test/ui/issues/issue-13775.rs",
+    "test/ui/issues/issue-34074.rs",
+    "test/ui/proc-macro/trait-fn-args-2015.rs",
+
+    // Not actually test cases
+    "test/rustdoc-ui/test-compile-fail2.rs",
+    "test/rustdoc-ui/test-compile-fail3.rs",
+    "test/ui/include-single-expr-helper.rs",
+    "test/ui/include-single-expr-helper-1.rs",
+    "test/ui/issues/auxiliary/issue-21146-inc.rs",
+    "test/ui/json-bom-plus-crlf-multifile-aux.rs",
+    "test/ui/lint/expansion-time-include.rs",
+    "test/ui/macros/auxiliary/macro-comma-support.rs",
+    "test/ui/macros/auxiliary/macro-include-items-expr.rs",
+];
+
+pub fn base_dir_filter(entry: &DirEntry) -> bool {
+    let path = entry.path();
+    if path.is_dir() {
+        return true; // otherwise walkdir does not visit the files
+    }
+    if path.extension().map(|e| e != "rs").unwrap_or(true) {
+        return false;
+    }
+
+    let mut path_string = path.to_string_lossy();
+    if cfg!(windows) {
+        path_string = path_string.replace('\\', "/").into();
+    }
+    let path = if let Some(path) = path_string.strip_prefix("tests/rust/src/") {
+        path
+    } else if let Some(path) = path_string.strip_prefix("tests/rust/library/") {
+        path
+    } else {
+        panic!("unexpected path in Rust dist: {}", path_string);
+    };
+
+    // TODO assert that parsing fails on the parse-fail cases
+    if path.starts_with("test/parse-fail")
+        || path.starts_with("test/compile-fail")
+        || path.starts_with("test/rustfix")
+    {
+        return false;
+    }
+
+    if path.starts_with("test/ui") {
+        let stderr_path = entry.path().with_extension("stderr");
+        if stderr_path.exists() {
+            // Expected to fail in some way
+            return false;
+        }
+    }
+
+    !EXCLUDE.contains(&path)
+}
+
+#[allow(dead_code)]
+pub fn edition(path: &Path) -> &'static str {
+    if path.ends_with("dyn-2015-no-warnings-without-lints.rs") {
+        "2015"
+    } else {
+        "2018"
+    }
+}
+
+pub fn clone_rust() {
+    let needs_clone = match fs::read_to_string("tests/rust/COMMIT") {
+        Err(_) => true,
+        Ok(contents) => contents.trim() != REVISION,
+    };
+    if needs_clone {
+        download_and_unpack().unwrap();
+    }
+    let mut missing = String::new();
+    let test_src = Path::new("tests/rust/src");
+    for exclude in EXCLUDE {
+        if !test_src.join(exclude).exists() {
+            missing += "\ntests/rust/src/";
+            missing += exclude;
+        }
+    }
+    if !missing.is_empty() {
+        panic!("excluded test file does not exist:{}\n", missing);
+    }
+}
+
+fn download_and_unpack() -> Result<()> {
+    let url = format!(
+        "https://github.com/rust-lang/rust/archive/{}.tar.gz",
+        REVISION
+    );
+    let response = reqwest::blocking::get(&url)?.error_for_status()?;
+    let progress = Progress::new(response);
+    let decoder = GzDecoder::new(progress);
+    let mut archive = Archive::new(decoder);
+    let prefix = format!("rust-{}", REVISION);
+
+    let tests_rust = Path::new("tests/rust");
+    if tests_rust.exists() {
+        fs::remove_dir_all(tests_rust)?;
+    }
+
+    for entry in archive.entries()? {
+        let mut entry = entry?;
+        let path = entry.path()?;
+        if path == Path::new("pax_global_header") {
+            continue;
+        }
+        let relative = path.strip_prefix(&prefix)?;
+        let out = tests_rust.join(relative);
+        entry.unpack(&out)?;
+    }
+
+    fs::write("tests/rust/COMMIT", REVISION)?;
+    Ok(())
+}