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Rollup merge of #108958 - clubby789:unbox-the-hir, r=compiler-errors

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Remove box expressions from HIR

After #108516, `#[rustc_box]` is used at HIR->THIR lowering and this is no longer emitted, so it can be removed.

This is based on top of #108471 to help with conflicts, so 43490488ccacd1a822e9c621f5ed6fca99959a0b is the only relevant commit (sorry for all the duplicated pings!)

````@rustbot```` label +S-blocked
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Matthias Krüger 2023-03-17 08:42:37 +01:00 • committed by GitHub
commit 13ff2d42cd
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27 changed files with 12 additions and 73 deletions
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compiler/rustc_middle/src/traits/mod.rs
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@ -305,8 +305,6 @@ pub enum ObligationCauseCode<'tcx> {
SizedReturnType,
/// Yield type must be `Sized`.
SizedYieldType,
/// Box expression result type must be `Sized`.
SizedBoxType,
/// Inline asm operand type must be `Sized`.
InlineAsmSized,
/// `[expr; N]` requires `type_of(expr): Copy`.