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Improve CanDestroyType to handle remaining cases (#6943)

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This is only fixing the decision about *whether* to produce a witness.
Implementation of the witness is still a TODO, though where a body is
generated, it should also precisely reflect where one _needs_ to be
generated.

Note the tests:

- toolchain/lower/testdata/function/generic/import_core_witness.carbon
- toolchain/lower/testdata/function/generic/import_unused_def.carbon

These tests can probably be produced _without_ Core.Destroy, but I found
the essence of them while trying to build //examples with Core.Destroy
and a simpler minimization wasn't striking me.

Assisted-by: Google Antigravity with Gemini

---------

Co-authored-by: jonmeow <jperkins@google.com>
This commit is contained in:
Jon Ross-Perkins
2026-04-02 22:54:58 +00:00
committed by GitHub
co-authored by jonmeow
parent 1fa7a64cd4
commit 9266ced4e3
212 changed files with 11376 additions and 4978 deletions
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toolchain/check/import_ref.cpp
+1 -1
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@@ -2349,7 +2349,7 @@ static auto TryResolveTypedInst(ImportRefResolver& resolver,
break;
}
case SemIR::Function::SpecialFunctionKind::CoreWitness: {
new_function.SetCoreWitness();
new_function.SetCoreWitness(import_function.builtin_function_kind());
break;
}
case SemIR::Function::SpecialFunctionKind::Thunk: {