From bfaf027a3be3b0328756f4edb41360b9749f83aa Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Sun, 29 Mar 2026 19:06:43 -0700
Subject: [PATCH] rustdoc: include index-page in dep-info

---
 src/librustdoc/config.rs                      | 10 ++++++----
 tests/run-make/rustdoc-dep-info/index-page.md |  3 +++
 tests/run-make/rustdoc-dep-info/rmake.rs      |  4 ++++
 3 files changed, 13 insertions(+), 4 deletions(-)
 create mode 100644 tests/run-make/rustdoc-dep-info/index-page.md

diff --git a/src/librustdoc/config.rs b/src/librustdoc/config.rs
index d721034c2d71..67d1105a5fa2 100644
--- a/src/librustdoc/config.rs
+++ b/src/librustdoc/config.rs
@@ -744,10 +744,12 @@ fn println_condition(condition: Condition) {
         }
 
         let index_page = matches.opt_str("index-page").map(|s| PathBuf::from(&s));
-        if let Some(ref index_page) = index_page
-            && !index_page.is_file()
-        {
-            dcx.fatal("option `--index-page` argument must be a file");
+        if let Some(ref index_page) = index_page {
+            if index_page.is_file() {
+                loaded_paths.push(index_page.clone());
+            } else {
+                dcx.fatal("option `--index-page` argument must be a file");
+            }
         }
 
         let target = parse_target_triple(early_dcx, matches);
diff --git a/tests/run-make/rustdoc-dep-info/index-page.md b/tests/run-make/rustdoc-dep-info/index-page.md
new file mode 100644
index 000000000000..95fa11ed0b76
--- /dev/null
+++ b/tests/run-make/rustdoc-dep-info/index-page.md
@@ -0,0 +1,3 @@
+% Index page
+
+Index page
diff --git a/tests/run-make/rustdoc-dep-info/rmake.rs b/tests/run-make/rustdoc-dep-info/rmake.rs
index 1e3d46bd4328..233225fde869 100644
--- a/tests/run-make/rustdoc-dep-info/rmake.rs
+++ b/tests/run-make/rustdoc-dep-info/rmake.rs
@@ -19,6 +19,7 @@ fn main() {
         .arg("--markdown-after-content=after.md")
         .arg("--extend-css=extend.css")
         .arg("--theme=theme.css")
+        .arg("--index-page=index-page.md")
         .emit("dep-info")
         .run();
 
@@ -31,6 +32,7 @@ fn main() {
     assert_contains(&content, "before.html:");
     assert_contains(&content, "extend.css:");
     assert_contains(&content, "theme.css:");
+    assert_contains(&content, "index-page.md:");
 
     // Now we check that we can provide a file name to the `dep-info` argument.
     rustdoc().input("lib.rs").arg("-Zunstable-options").emit("dep-info=bla.d").run();
@@ -80,6 +82,7 @@ fn main() {
         .arg("--markdown-after-content=after.md")
         .arg("--extend-css=extend.css")
         .arg("--theme=theme.css")
+        .arg("--index-page=index-page.md")
         .emit("dep-info=example.d")
         .run();
     let content = rfs::read_to_string("example.d");
@@ -92,4 +95,5 @@ fn main() {
     assert_contains(&content, "before.html:");
     assert_contains(&content, "extend.css:");
     assert_contains(&content, "theme.css:");
+    assert_contains(&content, "index-page.md:");
 }