fix(main)!: change dist path for rustc-docs

src/main.rs

@@ -508,17 +508,30 @@ impl Context {
 
             // Construct the path that contains the documentation inside the tarball.
             let tarball_dir = format!("{tarball_prefix}/rustc-docs/share/doc/rust/html");
-            let tarball_dir_new = format!("{tarball_dir}/rustc");
-
-            if Command::new("tar")
-                .arg("tf")
-                .arg(&tarball)
-                .arg(&tarball_dir_new)
-                .current_dir(&rustc_docs)
-                .output()?
-                .status
-                .success()
-            {
+
+            // NOTE: The following logic is to accommodate 3 different `rustc-docs` structures that
+            // have existed over time, in the chronological order:
+            // - No subdirectory: `share/doc/rust/html/...`
+            // - With `rustc/` subdirectory: `share/doc/rust/html/rustc/...`
+            // - With `rustc-docs/` subdirectory: `share/doc/rust/html/rustc-docs/...`
+            let mut tarball_dir_new = None;
+            for subdir in ["rustc-docs", "rustc"] {
+                let candidate = format!("{tarball_dir}/{subdir}");
+                if Command::new("tar")
+                    .arg("tf")
+                    .arg(&tarball)
+                    .arg(&candidate)
+                    .current_dir(&rustc_docs)
+                    .output()?
+                    .status
+                    .success()
+                {
+                    // The candidate directory exists in the tarball.
+                    tarball_dir_new = Some(candidate);
+                    break;
+                }
+            }
+            if let Some(tarball_dir_new) = tarball_dir_new {
                 // Unpack the rustc documentation into the new directory.
                 // // Touch all files as well (see above for why).
                 run(Command::new("tar")