Squashed 'third_party/autocxx/' content from commit 629e8fa53

git-subtree-dir: third_party/autocxx
git-subtree-split: 629e8fa531a633164c0b52e2a3cab536d4cd0849
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>
Change-Id: I62a03b0049f49adf029e0204639cdb5468dde1a1
diff --git a/engine/src/conversion/doc_attr.rs b/engine/src/conversion/doc_attr.rs
new file mode 100644
index 0000000..8fe9d0b
--- /dev/null
+++ b/engine/src/conversion/doc_attr.rs
@@ -0,0 +1,18 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use syn::Attribute;
+
+/// Returns the attribute (if any) which contains a doc comment.
+pub(super) fn get_doc_attrs(attrs: &[Attribute]) -> Vec<Attribute> {
+    attrs
+        .iter()
+        .filter(|a| a.path.get_ident().iter().any(|p| *p == "doc"))
+        .cloned()
+        .collect()
+}