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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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4
compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
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@ -6,7 +6,7 @@ use rustc_hir::def::Res;
use rustc_hir::def::{CtorOf, DefKind, Namespace};
use rustc_hir::def_id::DefId;
use rustc_hir::intravisit::{self, Visitor};
use rustc_hir::{Body, Expr, ExprKind, FnRetTy, HirId, Local, LocalSource};
use rustc_hir::{Body, Closure, Expr, ExprKind, FnRetTy, HirId, Local, LocalSource};
use rustc_middle::hir::nested_filter;
use rustc_middle::infer::unify_key::ConstVariableOriginKind;
use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
@ -1051,7 +1051,7 @@ impl<'a, 'tcx> Visitor<'tcx> for FindInferSourceVisitor<'a, 'tcx> {
if let Some(node_ty) = self.opt_node_type(expr.hir_id) {
if let (
&ExprKind::Closure { fn_decl, body, fn_decl_span, .. },
&ExprKind::Closure(&Closure { fn_decl, body, fn_decl_span, .. }),
ty::Closure(_, substs),
) = (&expr.kind, node_ty.kind())
{