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backend=auto (now the default if backend is omitted) means to let the compiler
pick whatever backend it wants as the default. This is important for platforms
where we don't yet have a self-hosted backend, such as loongarch64.
Also purge a bunch of redundant target=native.
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This is all of the expected 0.14.0 progress on #21530, which can now be
postponed once this commit is merged.
This required rewriting the (un)wrap operations since the original
implementations were extremely buggy.
Also adds an easy way to retrigger Sema OPV bugs so that I don't have to
keep updating #22419 all the time.
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This change seeks to more appropriately model the way semantic analysis
works by drawing a more clear line between errors emitted by analyzing a
`Decl` (in future a `Cau`) and errors emitted by analyzing a runtime
function.
This does change a few compile errors surrounding compile logs by adding
more "also here" notes. The new notes are more technically correct, but
perhaps not so helpful. They're not doing enough harm for me to put
extensive thought into this for now.
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The idea here is that there are two ways we can reference a function at runtime:
* Through a direct call, i.e. where the function is comptime-known
* Through a function pointer
This means we can easily perform a form of rudimentary escape analysis
on functions. If we ever see a `decl_ref` or `ref` of a function, we
have a function pointer, which could "leak" into runtime code, so we
emit the function; but for a plain `decl_val`, there's no need to.
This change means that `comptime { _ = f; }` no longer forces a function
to be emitted, which was used for some things (mainly tests). These use
sites have been replaced with `_ = &f;`, which still triggers analysis
of the function body, since you're taking a pointer to the function.
Resolves: #6256
Resolves: #15353
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The new testing harness is not bound by previous limitations; it can now
test compile log output as well.
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Close #12204
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