Check all files in src/test for borrowck_graphviz_postflow

This attribute causes DOT files to be generated in the top-level
directory. It is intended to be used only temporarily and should never
appear on master.

This will prevent #65071 from occurring again.

src/tools/tidy/src/debug_artifacts.rs

@@ -0,0 +1,24 @@
+//! Tidy check to prevent creation of unnecessary debug artifacts.
+
+use std::path::{Path, PathBuf};
+
+const GRAPHVIZ_POSTFLOW_MSG: &'static str =
+    "`borrowck_graphviz_postflow` attribute in test";
+
+pub fn check(path: &Path, bad: &mut bool) {
+    let test_dir: PathBuf = path.join("test");
+
+    super::walk(&test_dir, &mut super::filter_dirs, &mut |entry, contents| {
+        let filename = entry.path();
+        let is_rust = filename.extension().map_or(false, |ext| ext == "rs");
+        if !is_rust {
+            return;
+        }
+
+        for (i, line) in contents.lines().enumerate() {
+            if line.contains("borrowck_graphviz_postflow") {
+                tidy_error!(bad, "{}:{}: {}", filename.display(), i + 1, GRAPHVIZ_POSTFLOW_MSG);
+            }
+        }
+    });
+}

src/tools/tidy/src/lib.rs

@@ -31,6 +31,7 @@ macro_rules! tidy_error {
 
 pub mod bins;
 pub mod style;
+pub mod debug_artifacts;
 pub mod errors;
 pub mod features;
 pub mod cargo;

src/tools/tidy/src/main.rs

@@ -22,6 +22,7 @@ fn main() {
     let verbose = args.iter().any(|s| *s == "--verbose");
     bins::check(&path, &mut bad);
     style::check(&path, &mut bad);
+    debug_artifacts::check(&path, &mut bad);
     errors::check(&path, &mut bad);
     cargo::check(&path, &mut bad);
     edition::check(&path, &mut bad);