do expose the query result -- we're gonna need it

crates/re_query2/src/lib.rs

@@ -69,5 +69,8 @@ pub trait ToArchetype<A: re_types_core::Archetype> {
     ///
     /// Automatically handles all aspects of the query process: deserialization, caching, promise
     /// resolution, etc.
-    fn to_archetype(&self, resolver: &crate::PromiseResolver) -> crate::PromiseResult<A>;
+    fn to_archetype(
+        &self,
+        resolver: &crate::PromiseResolver,
+    ) -> crate::PromiseResult<crate::Result<A>>;
 }

crates/re_query_cache2/examples/latest_at_archetype.rs

@@ -39,7 +39,7 @@ fn main() -> anyhow::Result<()> {
     // cache an entire archetype all at once.
     use re_query_cache2::ToArchetype as _;
 
-    let arch: Points2D = match results.to_archetype(&resolver) {
+    let arch: Points2D = match results.to_archetype(&resolver).flatten() {
         PromiseResult::Pending => {
             // Handle the fact that the data isn't ready appropriately.
             return Ok(());