AaronBallman wrote:

> @AaronBallman, to be fair, clang is testing the wasm features in terms of 
> output. So this is wiring up a bunch of tested features that will allow 
> execution. Clang generally does not test execution but output, so we are not 
> creating a precedent here since that PR can be considered plumbing for 
> downstream consumers.

If we don't have community test coverage, we'll regress that plumbing for 
downstream consumers. In general, we shouldn't claim we support something we 
don't test. However, if there is a downstream consumer that agrees to be 
actively responsible for repairing breakages, we sometimes allow it (e.g., 
https://discourse.llvm.org/t/rfc-building-llvm-for-webassembly/79073)

https://github.com/llvm/llvm-project/pull/86402
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