bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/hir/src/lib.rs')
-rw-r--r--crates/hir/src/lib.rs47
1 files changed, 47 insertions, 0 deletions
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 96a6e6f1f1..74ec5227b0 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -2207,6 +2207,53 @@ impl Function {
db.function_data(self.id).is_async()
}
+ /// Whether this function is a `fn` that returns `impl Future`.
+ pub fn is_desugar_async(self, db: &dyn HirDatabase) -> bool {
+ if self.is_async(db) || self.is_const(db) {
+ return false;
+ }
+
+ let Some(impl_traits) = self.ret_type(db).as_impl_traits(db) else { return false };
+
+ let Some(future_trait_id) =
+ db.lang_item(self.ty(db).env.krate, LangItem::Future).and_then(|t| t.as_trait())
+ else {
+ return false;
+ };
+
+ let Some(size_trait_id) =
+ db.lang_item(self.ty(db).env.krate, LangItem::Sized).and_then(|t| t.as_trait())
+ else {
+ return false;
+ };
+
+ let Some(sync_trait_id) =
+ db.lang_item(self.ty(db).env.krate, LangItem::Sync).and_then(|t| t.as_trait())
+ else {
+ return false;
+ };
+
+ // TODO: There's no `LangItem::Send`. How do we get the id of `Send` trait?
+ // let Some(send_trait_id) = db.lang_item(self.ty(db).env.krate, LangItem::Send).and_then(|t| t.as_trait()) else {
+ // eprint!("no future_trait_id\n");
+ // return false
+ // };
+
+ let allowed_to_leaked_types = vec![size_trait_id, sync_trait_id];
+
+ let mut has_impl_future = false;
+ let mut has_types_not_allow_to_leaked = false;
+ for impl_trait in impl_traits {
+ if impl_trait.id == future_trait_id {
+ has_impl_future = true;
+ } else if !allowed_to_leaked_types.contains(&impl_trait.id) {
+ has_types_not_allow_to_leaked = true;
+ }
+ }
+
+ has_impl_future && !has_types_not_allow_to_leaked
+ }
+
/// Does this function have `#[test]` attribute?
pub fn is_test(self, db: &dyn HirDatabase) -> bool {
db.function_data(self.id).attrs.is_test()