From e359ee27fc3da3356d71a732128c0a1abe02e53a Mon Sep 17 00:00:00 2001
From: nils <48135649+Nilstrieb@users.noreply.github.com>
Date: Mon, 30 Jan 2023 16:08:16 +0100
Subject: [PATCH] New infcx usage (#1571)

Fixes https://github.com/rust-lang/rustc-dev-guide/issues/1543
---
 src/type-inference.md | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/src/type-inference.md b/src/type-inference.md
index ca88c168..2bafeb24 100644
--- a/src/type-inference.md
+++ b/src/type-inference.md
@@ -36,18 +36,16 @@ signature, such as the `'a` in `for<'a> fn(&'a u32)`. A region is
 
 ## Creating an inference context
 
-You create and "enter" an inference context by doing something like
+You create an inference context by doing something like
 the following:
 
 ```rust,ignore
-tcx.infer_ctxt().enter(|infcx| {
-    // Use the inference context `infcx` here.
-})
+let infcx = tcx.infer_ctxt().build();
+// Use the inference context `infcx` here.
 ```
 
-Within the closure,
-`infcx` has the type `InferCtxt<'a, 'tcx>` for some fresh `'a`,
-while `'tcx` is the same as outside the inference context.
+`infcx` has the type `InferCtxt<'tcx>`, the same `'tcx` lifetime as on
+the `tcx` it was built from.
 
 The `tcx.infer_ctxt` method actually returns a builder, which means
 there are some kinds of configuration you can do before the `infcx` is