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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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4
compiler/rustc_ast/src/util/parser.rs
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@ -259,7 +259,6 @@ pub enum ExprPrecedence {
Assign,
AssignOp,
Box,
AddrOf,
Let,
Unary,
@ -319,8 +318,7 @@ impl ExprPrecedence {
ExprPrecedence::AssignOp => AssocOp::Assign.precedence() as i8,
// Unary, prefix
ExprPrecedence::Box
| ExprPrecedence::AddrOf
ExprPrecedence::AddrOf
// Here `let pats = expr` has `let pats =` as a "unary" prefix of `expr`.
// However, this is not exactly right. When `let _ = a` is the LHS of a binop we
// need parens sometimes. E.g. we can print `(let _ = a) && b` as `let _ = a && b`