Automatic toolchain upgrade to nightly-2026-01-07

[github-actions]

Update Rust toolchain from nightly-2026-01-06 to nightly-2026-01-07 without any other source changes.

[github-actions]

This is an automatically generated pull request. If any of the CI checks fail,
manual intervention is required. In such a case, review the changes at
https://github.com/rust-lang/rust from
rust-lang/rust@4fa80a5 up to
rust-lang/rust@0aced20. The log
for this commit range is:

https://github.com/rust-lang/rust/commit/0aced202c2 Auto merge of #150729 - matthiaskrgr:rollup-an2m4zg, r=matthiaskrgr

rust-lang/rust@799c06fa9a Rollup merge of #150728 - fee1-dead-contrib:const-traits-test-cleanup, r=fmease
rust-lang/rust@9c45483fe6 Rollup merge of #150704 - Kivooeo:const-ctor, r=BoxyUwU
rust-lang/rust@e5a2b25f4c Rollup merge of #150521 - petrochenkov:decl, r=nnethercote
rust-lang/rust@8add20b77f Rollup merge of #150026 - Delta17920:fix/150002-macro-concat-bug, r=jdonszelmann
rust-lang/rust@d101412517 Cleanup some ui tests for const-traits
rust-lang/rust@4d73a008ea Auto merge of #150726 - JonathanBrouwer:rollup-yseerwy, r=JonathanBrouwer
rust-lang/rust@db26d01211 resolve: DeclKind::Import::binding -> DeclKind::Import::source_decl
rust-lang/rust@a0ea3b0635 Update more function names and fields from bindings to declarations
rust-lang/rust@a67e289b4d Update some function names and fields from bindings to declarations
rust-lang/rust@844e085de6 resolve: MacroRulesScope::Binding -> MacroRulesScope::Def
rust-lang/rust@7a34af2f67 resolve: Rename LexicalScopeBinding::(Item,Res) to LateDecl::(Decl,RibDef)
rust-lang/rust@460f22c388 resolve: Rename NameBinding(Data,Kind) to Decl(Data,Kind)
rust-lang/rust@9c9ecb18bc Rollup merge of #150708 - Kobzol:merge-queue, r=marcoieni
rust-lang/rust@58b1130a18 Rollup merge of #150707 - Delta17920:fix-transmute-valtree-ice, r=BoxyUwU
rust-lang/rust@0d9ea4f74a Rollup merge of #150706 - alexcrichton:update-wasm-component-ld, r=Mark-Simulacrum
rust-lang/rust@959736de75 Rollup merge of #150698 - hkBst:patch-6, r=jdonszelmann
rust-lang/rust@dd08360136 Rollup merge of #150695 - Kivooeo:pretty-printing, r=BoxyUwU
rust-lang/rust@ce42a619a2 Rollup merge of #150670 - Zalathar:let-ty, r=Nadrieril
rust-lang/rust@3b0d35f94b Rollup merge of #150412 - the8472:pidfd-spawn, r=tgross35
rust-lang/rust@0a7a92d7b1 Rollup merge of #150122 - reddevilmidzy:refactor, r=lcnr
rust-lang/rust@dea8b8b3c0 Rollup merge of #149880 - durin42:llvm-22-ppc-aix-layout, r=nikic
rust-lang/rust@8b1bf8af85 Rollup merge of #144113 - mu001999-contrib:dead-code/allow-trait, r=jdonszelmann
rust-lang/rust@d32f1c695f add const ctor support
rust-lang/rust@74fd7516da Auto merge of #147893 - fee1-dead-contrib:constheapheapheap, r=oli-obk
rust-lang/rust@da476f1942 Auto merge of #150640 - AprilNEA:mgca-merge-associated-const-equality, r=BoxyUwU
rust-lang/rust@56cb5d598b rename the lower_anon_const_to_const_arg and lower_anon_const_to_const_arg_direct to lower_anon_const_to_const_arg_and_alloc and lower_anon_const_to_const_arg
rust-lang/rust@b0a581d51d rename the lower_ty and lower_ty_direct to lower_ty_and_alloc and lower_ty
rust-lang/rust@7c04f5d216 Auto merge of #150702 - lnicola:sync-from-ra, r=lnicola