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Auto merge of #112887 - WaffleLapkin:become_unuwuable_in_hir, r=compiler-errors,Nilstrieb

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`hir`: Add `Become` expression kind (explicit tail calls experiment)

This adds `hir::ExprKind::Become` alongside ast lowering. During hir-thir lowering we currently lower `become` as `return`, so that we can partially test `become` without ICEing.

cc `@scottmcm`
r? `@Nilstrieb`
This commit is contained in:
bors 2023-06-26 13:51:04 +00:00
commit 6f8c27ae89
35 changed files with 286 additions and 72 deletions
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5
compiler/rustc_hir/src/hir.rs
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@ -1719,6 +1719,7 @@ impl Expr<'_> {
ExprKind::Break(..) => ExprPrecedence::Break,
ExprKind::Continue(..) => ExprPrecedence::Continue,
ExprKind::Ret(..) => ExprPrecedence::Ret,
ExprKind::Become(..) => ExprPrecedence::Become,
ExprKind::InlineAsm(..) => ExprPrecedence::InlineAsm,
ExprKind::OffsetOf(..) => ExprPrecedence::OffsetOf,
ExprKind::Struct(..) => ExprPrecedence::Struct,
@ -1776,6 +1777,7 @@ impl Expr<'_> {
| ExprKind::Break(..)
| ExprKind::Continue(..)
| ExprKind::Ret(..)
| ExprKind::Become(..)
| ExprKind::Let(..)
| ExprKind::Loop(..)
| ExprKind::Assign(..)
@ -1866,6 +1868,7 @@ impl Expr<'_> {
| ExprKind::Break(..)
| ExprKind::Continue(..)
| ExprKind::Ret(..)
| ExprKind::Become(..)
| ExprKind::Let(..)
| ExprKind::Loop(..)
| ExprKind::Assign(..)
@ -2025,6 +2028,8 @@ pub enum ExprKind<'hir> {
Continue(Destination),
/// A `return`, with an optional value to be returned.
Ret(Option<&'hir Expr<'hir>>),
/// A `become`, with the value to be returned.
Become(&'hir Expr<'hir>),
/// Inline assembly (from `asm!`), with its outputs and inputs.
InlineAsm(&'hir InlineAsm<'hir>),