Rustup to rust-lang/rust#89449

Author: jdisanti

README.md

@@ -27,13 +27,13 @@ repository and compiled from source or installed from
 of the nightly toolchain is supported at any given time.
 
 <!-- NOTE: Keep in sync with nightly date on rust-toolchain. -->
-It's recommended to use `nightly-2021-09-30` toolchain.
-You can install it by using `rustup install nightly-2021-09-30` if you already have rustup.
+It's recommended to use `nightly-2021-10-15` toolchain.
+You can install it by using `rustup install nightly-2021-10-15` if you already have rustup.
 Then you can do:
 
 ```sh
-$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2021-09-30
-$ cargo +nightly-2021-09-30 install --git https://github.com/rust-lang/rust-semverver
+$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2021-10-15
+$ cargo +nightly-2021-10-15 install --git https://github.com/rust-lang/rust-semverver
 ```
 
 You'd also need `cmake` for some dependencies, and a few common libraries (if you hit

rust-toolchain

@@ -1,4 +1,4 @@
 # NOTE: Keep in sync with nightly date on README
 [toolchain]
-channel = "nightly-2021-09-30"
+channel = "nightly-2021-10-15"
 components = ["llvm-tools-preview", "rustc-dev"]

src/traverse.rs

@@ -17,7 +17,6 @@ use crate::{
     typeck::{BoundContext, TypeComparisonContext},
 };
 use log::{debug, info};
-use rustc_const_eval::const_eval::is_const_fn;
 use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res, Res::Def};
 use rustc_hir::def_id::DefId;
 use rustc_hir::hir_id::HirId;
@@ -363,8 +362,8 @@ fn diff_fn<'tcx>(changes: &mut ChangeSet, tcx: TyCtxt<'tcx>, old: Res, new: Res)
     let old_def_id = old.def_id();
     let new_def_id = new.def_id();
 
-    let old_const = is_const_fn(tcx, old_def_id);
-    let new_const = is_const_fn(tcx, new_def_id);
+    let old_const = tcx.is_const_fn(old_def_id);
+    let new_const = tcx.is_const_fn(new_def_id);
 
     if old_const != new_const {
         changes.add_change(