diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad3722d4d0bd..9f89f74e7450 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -592,7 +592,7 @@ Released 2021-02-11
 
 * Previously deprecated [`str_to_string`] and [`string_to_string`] have been un-deprecated
   as `restriction` lints [#6333](https://github.com/rust-lang/rust-clippy/pull/6333)
-* Deprecate `panic_params` lint. This is now available in rustc as `non_fmt_panic`
+* Deprecate `panic_params` lint. This is now available in rustc as `non_fmt_panics`
   [#6351](https://github.com/rust-lang/rust-clippy/pull/6351)
 * Move [`map_err_ignore`] to `restriction`
   [#6416](https://github.com/rust-lang/rust-clippy/pull/6416)
diff --git a/clippy_lints/src/doc.rs b/clippy_lints/src/doc.rs
index 17d868f1ec82..0c19988a975a 100644
--- a/clippy_lints/src/doc.rs
+++ b/clippy_lints/src/doc.rs
@@ -26,6 +26,7 @@ use rustc_span::source_map::{BytePos, FilePathMapping, MultiSpan, SourceMap, Spa
 use rustc_span::{sym, FileName, Pos};
 use std::io;
 use std::ops::Range;
+use std::thread;
 use url::Url;
 
 declare_clippy_lint! {
@@ -584,17 +585,17 @@ fn get_current_span(spans: &[(usize, Span)], idx: usize) -> (usize, Span) {
 }
 
 fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
-    fn has_needless_main(code: &str, edition: Edition) -> bool {
+    fn has_needless_main(code: String, edition: Edition) -> bool {
         rustc_driver::catch_fatal_errors(|| {
-            rustc_span::with_session_globals(edition, || {
-                let filename = FileName::anon_source_code(code);
+            rustc_span::create_session_globals_then(edition, || {
+                let filename = FileName::anon_source_code(&code);
 
                 let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
                 let emitter = EmitterWriter::new(box io::sink(), None, false, false, false, None, false);
                 let handler = Handler::with_emitter(false, None, box emitter);
                 let sess = ParseSess::with_span_handler(handler, sm);
 
-                let mut parser = match maybe_new_parser_from_source_str(&sess, filename, code.into()) {
+                let mut parser = match maybe_new_parser_from_source_str(&sess, filename, code) {
                     Ok(p) => p,
                     Err(errs) => {
                         for mut err in errs {
@@ -649,7 +650,13 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
         .unwrap_or_default()
     }
 
-    if has_needless_main(text, edition) {
+    // Because of the global session, we need to create a new session in a different thread with
+    // the edition we need.
+    let text = text.to_owned();
+    if thread::spawn(move || has_needless_main(text, edition))
+        .join()
+        .expect("thread::spawn failed")
+    {
         span_lint(cx, NEEDLESS_DOCTEST_MAIN, span, "needless `fn main` in doctest");
     }
 }
diff --git a/clippy_lints/src/implicit_hasher.rs b/clippy_lints/src/implicit_hasher.rs
index 03fe0d16d480..4f8f3aa96cb1 100644
--- a/clippy_lints/src/implicit_hasher.rs
+++ b/clippy_lints/src/implicit_hasher.rs
@@ -1,5 +1,3 @@
-#![allow(rustc::default_hash_types)]
-
 use std::borrow::Cow;
 use std::collections::BTreeMap;
 
diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 82519a9b5b73..1af3a215f446 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -2177,7 +2177,7 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) {
     ls.register_renamed("clippy::unused_label", "unused_labels");
     ls.register_renamed("clippy::drop_bounds", "drop_bounds");
     ls.register_renamed("clippy::temporary_cstring_as_ptr", "temporary_cstring_as_ptr");
-    ls.register_renamed("clippy::panic_params", "non_fmt_panic");
+    ls.register_renamed("clippy::panic_params", "non_fmt_panics");
     ls.register_renamed("clippy::unknown_clippy_lints", "unknown_lints");
 }
 
diff --git a/clippy_lints/src/misc.rs b/clippy_lints/src/misc.rs
index 804c04fe1b83..7cfce2e61cca 100644
--- a/clippy_lints/src/misc.rs
+++ b/clippy_lints/src/misc.rs
@@ -662,14 +662,7 @@ fn in_attributes_expansion(expr: &Expr<'_>) -> bool {
     use rustc_span::hygiene::MacroKind;
     if expr.span.from_expansion() {
         let data = expr.span.ctxt().outer_expn_data();
-        matches!(
-            data.kind,
-            ExpnKind::Macro {
-                kind: MacroKind::Attr,
-                name: _,
-                proc_macro: _
-            }
-        )
+        matches!(data.kind, ExpnKind::Macro(MacroKind::Attr, _))
     } else {
         false
     }
diff --git a/clippy_lints/src/mut_key.rs b/clippy_lints/src/mut_key.rs
index 6c87136e5e14..4dbbb14c504f 100644
--- a/clippy_lints/src/mut_key.rs
+++ b/clippy_lints/src/mut_key.rs
@@ -120,8 +120,8 @@ fn is_mutable_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, span: Span) -> bo
         },
         Tuple(..) => ty.tuple_fields().any(|ty| is_mutable_type(cx, ty, span)),
         Adt(..) => {
-            cx.tcx.layout_of(cx.param_env.and(ty)).is_ok()
-                && !ty.has_escaping_bound_vars()
+            !ty.has_escaping_bound_vars()
+                && cx.tcx.layout_of(cx.param_env.and(ty)).is_ok()
                 && !ty.is_freeze(cx.tcx.at(span), cx.param_env)
         },
         _ => false,
diff --git a/clippy_lints/src/unit_types/unit_cmp.rs b/clippy_lints/src/unit_types/unit_cmp.rs
index 045421465168..85257f3113cb 100644
--- a/clippy_lints/src/unit_types/unit_cmp.rs
+++ b/clippy_lints/src/unit_types/unit_cmp.rs
@@ -8,12 +8,7 @@ use super::UNIT_CMP;
 pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>) {
     if expr.span.from_expansion() {
         if let Some(callee) = expr.span.source_callee() {
-            if let ExpnKind::Macro {
-                kind: MacroKind::Bang,
-                name: symbol,
-                proc_macro: _,
-            } = callee.kind
-            {
+            if let ExpnKind::Macro(MacroKind::Bang, symbol) = callee.kind {
                 if let ExprKind::Binary(ref cmp, left, _) = expr.kind {
                     let op = cmp.node;
                     if op.is_comparison() && cx.typeck_results().expr_ty(left).is_unit() {
diff --git a/clippy_lints/src/utils/internal_lints/metadata_collector.rs b/clippy_lints/src/utils/internal_lints/metadata_collector.rs
index e877af09e289..3eccc89cdeb8 100644
--- a/clippy_lints/src/utils/internal_lints/metadata_collector.rs
+++ b/clippy_lints/src/utils/internal_lints/metadata_collector.rs
@@ -520,7 +520,9 @@ fn get_lint_group_and_level_or_lint(
     lint_name: &str,
     item: &'hir Item<'_>,
 ) -> Option<(String, &'static str)> {
-    let result = cx.lint_store.check_lint_name(lint_name, Some(sym::clippy));
+    let result = cx
+        .lint_store
+        .check_lint_name(cx.sess(), lint_name, Some(sym::clippy), &[]);
     if let CheckLintNameResult::Tool(Ok(lint_lst)) = result {
         if let Some(group) = get_lint_group(cx, lint_lst[0]) {
             if EXCLUDED_LINT_GROUPS.contains(&group.as_str()) {
diff --git a/clippy_utils/src/higher.rs b/clippy_utils/src/higher.rs
index 5ffd88f41404..3e3e472e99fb 100644
--- a/clippy_utils/src/higher.rs
+++ b/clippy_utils/src/higher.rs
@@ -285,7 +285,7 @@ impl FormatExpn<'tcx> {
             if let Some(init) = local.init;
             if let ExprKind::Call(_, [format_args]) = init.kind;
             let expn_data = expr.span.ctxt().outer_expn_data();
-            if let ExpnKind::Macro { name: sym::format, .. } = expn_data.kind;
+            if let ExpnKind::Macro(_, sym::format) = expn_data.kind;
             if let Some(format_args) = FormatArgsExpn::parse(format_args);
             then {
                 Some(FormatExpn {
@@ -320,7 +320,7 @@ impl FormatArgsExpn<'tcx> {
     /// Parses an expanded `format_args!` or `format_args_nl!` invocation
     pub fn parse(expr: &'tcx Expr<'tcx>) -> Option<Self> {
         if_chain! {
-            if let ExpnKind::Macro { name, .. } = expr.span.ctxt().outer_expn_data().kind;
+            if let ExpnKind::Macro(_, name) = expr.span.ctxt().outer_expn_data().kind;
             let name = name.as_str();
             if name.ends_with("format_args") || name.ends_with("format_args_nl");
             if let ExprKind::Call(_, args) = expr.kind;
diff --git a/clippy_utils/src/lib.rs b/clippy_utils/src/lib.rs
index 364ae536ecd5..6db221ab0fdf 100644
--- a/clippy_utils/src/lib.rs
+++ b/clippy_utils/src/lib.rs
@@ -483,7 +483,7 @@ pub fn path_to_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
         _ => return Res::Err,
     };
     let tcx = cx.tcx;
-    let crates = tcx.crates();
+    let crates = tcx.crates(());
     let krate = try_res!(crates.iter().find(|&&num| tcx.crate_name(num).as_str() == krate));
     let first = try_res!(item_child_by_name(tcx, krate.as_def_id(), first));
     let last = path
@@ -953,12 +953,7 @@ pub fn is_expn_of(mut span: Span, name: &str) -> Option<Span> {
             let data = span.ctxt().outer_expn_data();
             let new_span = data.call_site;
 
-            if let ExpnKind::Macro {
-                kind: MacroKind::Bang,
-                name: mac_name,
-                proc_macro: _,
-            } = data.kind
-            {
+            if let ExpnKind::Macro(MacroKind::Bang, mac_name) = data.kind {
                 if mac_name.as_str() == name {
                     return Some(new_span);
                 }
@@ -986,12 +981,7 @@ pub fn is_direct_expn_of(span: Span, name: &str) -> Option<Span> {
         let data = span.ctxt().outer_expn_data();
         let new_span = data.call_site;
 
-        if let ExpnKind::Macro {
-            kind: MacroKind::Bang,
-            name: mac_name,
-            proc_macro: _,
-        } = data.kind
-        {
+        if let ExpnKind::Macro(MacroKind::Bang, mac_name) = data.kind {
             if mac_name.as_str() == name {
                 return Some(new_span);
             }
diff --git a/clippy_utils/src/ty.rs b/clippy_utils/src/ty.rs
index 9e271b71204b..3f5c5604d43f 100644
--- a/clippy_utils/src/ty.rs
+++ b/clippy_utils/src/ty.rs
@@ -14,6 +14,7 @@ use rustc_middle::ty::{self, AdtDef, IntTy, Ty, TypeFoldable, UintTy};
 use rustc_span::sym;
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::DUMMY_SP;
+use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits::query::normalize::AtExt;
 
 use crate::{match_def_path, must_use_attr};
@@ -112,6 +113,7 @@ pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<
 }
 
 /// Checks whether a type implements a trait.
+/// The function returns false in case the type contains an inference variable.
 /// See also `get_trait_def_id`.
 pub fn implements_trait<'tcx>(
     cx: &LateContext<'tcx>,
@@ -119,16 +121,19 @@ pub fn implements_trait<'tcx>(
     trait_id: DefId,
     ty_params: &[GenericArg<'tcx>],
 ) -> bool {
-    // Do not check on infer_types to avoid panic in evaluate_obligation.
-    if ty.has_infer_types() {
-        return false;
-    }
+    // Clippy shouldn't have infer types
+    assert!(!ty.needs_infer());
+
     let ty = cx.tcx.erase_regions(ty);
     if ty.has_escaping_bound_vars() {
         return false;
     }
     let ty_params = cx.tcx.mk_substs(ty_params.iter());
-    cx.tcx.type_implements_trait((trait_id, ty, ty_params, cx.param_env))
+    cx.tcx.infer_ctxt().enter(|infcx| {
+        infcx
+            .type_implements_trait(trait_id, ty, ty_params, cx.param_env)
+            .must_apply_modulo_regions()
+    })
 }
 
 /// Checks whether this type implements `Drop`.
diff --git a/rust-toolchain b/rust-toolchain
index 2d3c65c1d398..bf9cfb61b46d 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-07-01"
+channel = "nightly-2021-07-15"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src"]
diff --git a/tests/ui/assertions_on_constants.rs b/tests/ui/assertions_on_constants.rs
index 6617ca183a8c..2180f848d62c 100644
--- a/tests/ui/assertions_on_constants.rs
+++ b/tests/ui/assertions_on_constants.rs
@@ -1,4 +1,4 @@
-#![allow(non_fmt_panic)]
+#![allow(non_fmt_panics)]
 
 macro_rules! assert_const {
     ($len:expr) => {
diff --git a/tests/ui/deprecated.stderr b/tests/ui/deprecated.stderr
index 0af6b500115d..c0002e535431 100644
--- a/tests/ui/deprecated.stderr
+++ b/tests/ui/deprecated.stderr
@@ -60,11 +60,11 @@ error: lint `clippy::temporary_cstring_as_ptr` has been renamed to `temporary_cs
 LL | #[warn(clippy::temporary_cstring_as_ptr)]
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `temporary_cstring_as_ptr`
 
-error: lint `clippy::panic_params` has been renamed to `non_fmt_panic`
+error: lint `clippy::panic_params` has been renamed to `non_fmt_panics`
   --> $DIR/deprecated.rs:11:8
    |
 LL | #[warn(clippy::panic_params)]
-   |        ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panic`
+   |        ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panics`
 
 error: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
   --> $DIR/deprecated.rs:12:8