1 files changed, 32 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/interface/function.rs b/third_party/rust/uniffi_bindgen/src/interface/function.rs
index 2d18288c1c..8effc4c876 100644
--- a/third_party/rust/uniffi_bindgen/src/interface/function.rs
+++ b/third_party/rust/uniffi_bindgen/src/interface/function.rs
@@ -59,6 +59,8 @@ pub struct Function {
     //    avoids a weird circular dependency in the calculation.
     #[checksum_ignore]
     pub(super) ffi_func: FfiFunction,
+    #[checksum_ignore]
+    pub(super) docstring: Option<String>,
     pub(super) throws: Option<Type>,
     pub(super) checksum_fn_name: String,
     // Force a checksum value, or we'll fallback to the trait.
@@ -128,6 +130,10 @@ impl Function {
                 .chain(self.return_type.iter().flat_map(Type::iter_types)),
         )
     }
+
+    pub fn docstring(&self) -> Option<&str> {
+        self.docstring.as_deref()
+    }
 }
 
 impl From<uniffi_meta::FnParamMetadata> for Argument {
@@ -163,6 +169,7 @@ impl From<uniffi_meta::FnMetadata> for Function {
             arguments,
             return_type,
             ffi_func,
+            docstring: meta.docstring.clone(),
             throws: meta.throws,
             checksum_fn_name,
             checksum: meta.checksum,
@@ -242,6 +249,9 @@ pub trait Callable {
     fn return_type(&self) -> Option<Type>;
     fn throws_type(&self) -> Option<Type>;
     fn is_async(&self) -> bool;
+    fn takes_self(&self) -> bool {
+        false
+    }
     fn result_type(&self) -> ResultType {
         ResultType {
             return_type: self.return_type(),
@@ -311,6 +321,10 @@ impl<T: Callable> Callable for &T {
     fn is_async(&self) -> bool {
         (*self).is_async()
     }
+
+    fn takes_self(&self) -> bool {
+        (*self).takes_self()
+    }
 }
 
 #[cfg(test)]
@@ -364,4 +378,22 @@ mod test {
         );
         Ok(())
     }
+
+    #[test]
+    fn test_docstring_function() {
+        const UDL: &str = r#"
+            namespace test {
+                /// informative docstring
+                void testing();
+            };
+        "#;
+        let ci = ComponentInterface::from_webidl(UDL, "crate_name").unwrap();
+        assert_eq!(
+            ci.get_function_definition("testing")
+                .unwrap()
+                .docstring()
+                .unwrap(),
+            "informative docstring"
+        );
+    }
 }