rustdoc: Prevent infinite recursion when inlining

Cyclic pub-use chains triggered infinite recursion, and this commit adds a hash
set to guard against cyclic recursion. This will cause one of the reexports to
render as a `pub use` instead of inlining the documentation.

Closes #16274

2 files changed, 35 insertions, 0 deletions

diff --git a/src/test/run-make/rustdoc-recursion/Makefile b/src/test/run-make/rustdoc-recursion/Makefile
new file mode 100644
index 00000000000..97c0385828d
--- /dev/null
+++ b/src/test/run-make/rustdoc-recursion/Makefile
@@ -0,0 +1,10 @@
+-include ../tools.mk
+
+# FIXME ignore windows
+ifndef IS_WINDOWS
+all:
+	$(HOST_RPATH_ENV) $(RUSTDOC) -w html -o $(TMPDIR)/doc foo.rs
+else
+all:
+endif
+
diff --git a/src/test/run-make/rustdoc-recursion/foo.rs b/src/test/run-make/rustdoc-recursion/foo.rs
new file mode 100644
index 00000000000..05f11205b71
--- /dev/null
+++ b/src/test/run-make/rustdoc-recursion/foo.rs
@@ -0,0 +1,25 @@
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![crate_type = "lib"]
+#![feature(globs)]
+
+mod m {
+    pub use self::a::Foo;
+
+    mod a {
+        pub struct Foo;
+    }
+
+    mod b {
+        pub use super::*;
+    }
+}
+