Require async types when lift/lower uses async#2512
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alexcrichton merged 1 commit intoMay 12, 2026
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pchickey
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May 12, 2026
This is an adjustment to the validation of component-model-async functions and types to correspond to WebAssembly/component-model#646. Specifically when using the `async` option to lift or lower a function it's now required that the component model type is additionally `async`. This means, for example, that `canon lower` of a sync-typed function cannot use the `async` ABI option. Additionally `canon lift` cannot use `async` if the destination component function type is synchronous. This notably required a number of updates throughout tests. My personal judgement on the required updates here is that everything was originally written without `async` function types since that didn't exist, then most of these weren't updated, but should have been, once `async` was added as a function type. In that sense I don't feel these are reflective of real-world breakage, but instead I think it's reflective of the history of the implementation's development.
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This is an adjustment to the validation of component-model-async functions and types to correspond to WebAssembly/component-model#646. Specifically when using the
asyncoption to lift or lower a function it's now required that the component model type is additionallyasync. This means, for example, thatcanon lowerof a sync-typed function cannot use theasyncABI option. Additionallycanon liftcannot useasyncif the destination component function type is synchronous.This notably required a number of updates throughout tests. My personal judgement on the required updates here is that everything was originally written without
asyncfunction types since that didn't exist, then most of these weren't updated, but should have been, onceasyncwas added as a function type. In that sense I don't feel these are reflective of real-world breakage, but instead I think it's reflective of the history of the implementation's development.