inline asm!: support writing _ in lieu of return types, for basic inference. #376
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The bulk of this PR is the first commit, containing a basic type constraint system for SPIR-V instructions, which I've been working on as a prerequisite for #300 (see module-scope doc comment for its limitations).
What I've done with inline
asm!is demonstrate the use of those constraints to alleviate the need to write sometypeof*{...}, letting the user write just_instead, and having the type be inferred automatically.However,
asm!inference is merely a potential usecase I thought of while working on the type constraint system, and I don't have a strong opinion on keeping it (this is partly the reason why I haven't made it fully-featured yet).