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Hi, I am working on a project to port the code to ispc, and run into the following problem. Please let me know how can I help to help to...

**Describe the bug** **To Reproduce** Steps to reproduce the behavior: 1. In tutorial `https://github.com/emilk/egui/blob/master/crates/egui_demo_lib/src/demo/drag_and_drop.rs#L72C1-L75C1`, replace ``` let response = ui .dnd_drag_source(item_id, item_location, |ui| { ui.label(item); }) .response; ``` with ```...