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Rollup merge of #98705 - WaffleLapkin:closure_binder, r=cjgillot

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Implement `for<>` lifetime binder for closures

This PR implements RFC 3216 ([TI](https://github.com/rust-lang/rust/issues/97362)) and allows code like the following:

```rust
let _f = for<'a, 'b> |a: &'a A, b: &'b B| -> &'b C { b.c(a) };
//       ^^^^^^^^^^^--- new!
```

cc ``@Aaron1011`` ``@cjgillot``
This commit is contained in:
Dylan DPC 2022-07-14 14:14:21 +05:30 • committed by GitHub
commit e5a86d7358
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91 changed files with 843 additions and 208 deletions
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7
compiler/rustc_mir_build/src/build/mod.rs
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@ -68,9 +68,10 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
// Figure out what primary body this item has.
let (body_id, return_ty_span, span_with_body) = match tcx.hir().get(id) {
Node::Expr(hir::Expr { kind: hir::ExprKind::Closure { fn_decl, body, .. }, .. }) => {
(*body, fn_decl.output.span(), None)
}
Node::Expr(hir::Expr {
kind: hir::ExprKind::Closure(hir::Closure { fn_decl, body, .. }),
..
}) => (*body, fn_decl.output.span(), None),
Node::Item(hir::Item {
kind: hir::ItemKind::Fn(hir::FnSig { decl, .. }, _, body_id),
span,