Function tier_executor_sizing 

pub const fn tier_executor_sizing(t: &TierSizing) -> ExecutorSizing

Issue 1970 – the ExecutorSizing one tier’s executor is carved at: its own callback slots, node slots, arena and declared parameters, and the image’s scheduling-context count. A tier that declares parameters on an image that carves no store carves none either (the store is built from the heap there, as it is for the image’s one executor).