Stream: git-wasmtime

Topic: wasmtime / issue #12467 Enable `WasmStr`/`WasmList` with ...

Wasmtime GitHub notifications bot (Jan 29 2026 at 17:56):

alexcrichton opened issue #12467:

Right now it's not possible to use these types as return values of a guest function with call_concurrent. The reason for this is that post-return is invoked automatically meaning that using these types would be using already-free'd memory in the guest. We should enable these types to work to unlock the possibility of zero-copy return values. This'll probably look like some sort of closure/trait passed to call_concurrent (ish) which is invoked once the values are received.

This is somewhat related to #12427 insofar as post-return is causing issues there.

Wasmtime GitHub notifications bot (Jan 29 2026 at 17:56):

alexcrichton added the wasm-proposal:component-model-async label to Issue #12467.

Last updated: Feb 24 2026 at 04:36 UTC