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Implement explicit tail calls#112657

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Commits on Jun 15, 2023

• Syntatically accept `become` expressions

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• `hir`: Add `Become` expression kind

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• `thir`: Add `Become` expression kind

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• Support tail calls in mir via `TerminatorKind::TailCall`

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• llvm ffi: Expose `CallInst->setTailCallKind`

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• Support tail calls in `rustc_codegen_{ssa,llvm}`

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• handle drops for tail calls

  

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• Add more tail call tests

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• Implement necessary checks for tail calls

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• `rustc_codegen_cranelift`: bug on tail calls

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• `rustc_codegen_gcc`: bug on tail calls

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• Implement `become` expression formatting in rustfmt

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• Add support for tail calls in clippy

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• Document `become` keyword

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• Add out-of-{async,generators} tests

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• Add a test for mismatch in `#[track_caller]` wrt tail calls

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• Add some more tail call tests

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