diff --git a/Cargo.toml b/Cargo.toml
index cbf3a6515cf..602877bb9d6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,12 +22,12 @@ path = "src/driver.rs"
 
 [dependencies]
 clippy_lints = { version = "0.1", path = "clippy_lints" }
-semver = "0.11"
+semver = "1.0"
 rustc_tools_util = { version = "0.2", path = "rustc_tools_util" }
 tempfile = { version = "3.2", optional = true }
 
 [dev-dependencies]
-cargo_metadata = "0.12"
+cargo_metadata = "0.14"
 compiletest_rs = { version = "0.7.1", features = ["tmp"] }
 tester = "0.9"
 regex = "1.5"
diff --git a/clippy_lints/Cargo.toml b/clippy_lints/Cargo.toml
index aaf9ac83d49..281480b8d94 100644
--- a/clippy_lints/Cargo.toml
+++ b/clippy_lints/Cargo.toml
@@ -9,7 +9,7 @@ keywords = ["clippy", "lint", "plugin"]
 edition = "2021"
 
 [dependencies]
-cargo_metadata = "0.12"
+cargo_metadata = "0.14"
 clippy_utils = { path = "../clippy_utils" }
 if_chain = "1.0"
 itertools = "0.10"
@@ -21,7 +21,7 @@ serde_json = { version = "1.0", optional = true }
 toml = "0.5"
 unicode-normalization = "0.1"
 unicode-script = { version = "0.5", default-features = false }
-semver = "0.11"
+semver = "1.0"
 rustc-semver = "1.1"
 # NOTE: cargo requires serde feat in its url dep
 # see <https://github.com/rust-lang/rust/pull/63587#issuecomment-522343864>
diff --git a/clippy_lints/src/vec.rs b/clippy_lints/src/vec.rs
index d124d948b5e..d3234b5758a 100644
--- a/clippy_lints/src/vec.rs
+++ b/clippy_lints/src/vec.rs
@@ -63,13 +63,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
             if is_copy(cx, vec_type(cx.typeck_results().expr_ty_adjusted(arg)));
             then {
                 // report the error around the `vec!` not inside `<std macros>:`
-                let span = arg.span
-                    .ctxt()
-                    .outer_expn_data()
-                    .call_site
-                    .ctxt()
-                    .outer_expn_data()
-                    .call_site;
+                let span = arg.span.ctxt().outer_expn_data().call_site;
                 self.check_vec_macro(cx, &vec_args, Mutability::Not, span);
             }
         }
diff --git a/rust-toolchain b/rust-toolchain
index 67eaf286004..09554c08987 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-10-21"
+channel = "nightly-2021-11-04"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src"]
diff --git a/tests/ui/crashes/ice-6252.stderr b/tests/ui/crashes/ice-6252.stderr
index 926ae39cc21..c8239897f3a 100644
--- a/tests/ui/crashes/ice-6252.stderr
+++ b/tests/ui/crashes/ice-6252.stderr
@@ -6,12 +6,12 @@ LL |     _n: PhantomData,
    |
 help: consider importing one of these items
    |
+LL | use core::marker::PhantomData;
+   |
 LL | use serde::__private::PhantomData;
    |
 LL | use std::marker::PhantomData;
    |
-LL | use core::marker::PhantomData;
-   |
 
 error[E0412]: cannot find type `VAL` in this scope
   --> $DIR/ice-6252.rs:10:63
diff --git a/tests/ui/iter_count.fixed b/tests/ui/iter_count.fixed
index 97c5929783d..90a6eef7526 100644
--- a/tests/ui/iter_count.fixed
+++ b/tests/ui/iter_count.fixed
@@ -33,6 +33,7 @@ impl HasIter {
     }
 }
 
+#[allow(unused_must_use)]
 fn main() {
     let mut vec = vec![0, 1, 2, 3];
     let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
@@ -50,7 +51,7 @@ fn main() {
     linked_list.push_back(1);
     binary_heap.push(1);
 
-    let _ = &vec[..].len();
+    &vec[..].len();
     vec.len();
     boxed_slice.len();
     vec_deque.len();
@@ -62,13 +63,13 @@ fn main() {
     binary_heap.len();
 
     vec.len();
-    let _ = &vec[..].len();
+    &vec[..].len();
     vec_deque.len();
     hash_map.len();
     b_tree_map.len();
     linked_list.len();
 
-    let _ = &vec[..].len();
+    &vec[..].len();
     vec.len();
     vec_deque.len();
     hash_set.len();
diff --git a/tests/ui/iter_count.rs b/tests/ui/iter_count.rs
index 70bb734763f..6681a480a28 100644
--- a/tests/ui/iter_count.rs
+++ b/tests/ui/iter_count.rs
@@ -33,6 +33,7 @@ fn into_iter(self) -> IteratorFalsePositives {
     }
 }
 
+#[allow(unused_must_use)]
 fn main() {
     let mut vec = vec![0, 1, 2, 3];
     let mut boxed_slice: Box<[u8]> = Box::new([0, 1, 2, 3]);
@@ -50,7 +51,7 @@ fn main() {
     linked_list.push_back(1);
     binary_heap.push(1);
 
-    let _ = &vec[..].iter().count();
+    &vec[..].iter().count();
     vec.iter().count();
     boxed_slice.iter().count();
     vec_deque.iter().count();
@@ -62,13 +63,13 @@ fn main() {
     binary_heap.iter().count();
 
     vec.iter_mut().count();
-    let _ = &vec[..].iter_mut().count();
+    &vec[..].iter_mut().count();
     vec_deque.iter_mut().count();
     hash_map.iter_mut().count();
     b_tree_map.iter_mut().count();
     linked_list.iter_mut().count();
 
-    let _ = &vec[..].into_iter().count();
+    &vec[..].into_iter().count();
     vec.into_iter().count();
     vec_deque.into_iter().count();
     hash_set.into_iter().count();
diff --git a/tests/ui/iter_count.stderr b/tests/ui/iter_count.stderr
index 1d2c22f9dfa..2e3d7fc35de 100644
--- a/tests/ui/iter_count.stderr
+++ b/tests/ui/iter_count.stderr
@@ -1,151 +1,151 @@
 error: called `.iter().count()` on a `slice`
-  --> $DIR/iter_count.rs:53:14
+  --> $DIR/iter_count.rs:54:6
    |
-LL |     let _ = &vec[..].iter().count();
-   |              ^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec[..].len()`
+LL |     &vec[..].iter().count();
+   |      ^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec[..].len()`
    |
    = note: `-D clippy::iter-count` implied by `-D warnings`
 
 error: called `.iter().count()` on a `Vec`
-  --> $DIR/iter_count.rs:54:5
+  --> $DIR/iter_count.rs:55:5
    |
 LL |     vec.iter().count();
    |     ^^^^^^^^^^^^^^^^^^ help: try: `vec.len()`
 
 error: called `.iter().count()` on a `slice`
-  --> $DIR/iter_count.rs:55:5
+  --> $DIR/iter_count.rs:56:5
    |
 LL |     boxed_slice.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `boxed_slice.len()`
 
 error: called `.iter().count()` on a `VecDeque`
-  --> $DIR/iter_count.rs:56:5
+  --> $DIR/iter_count.rs:57:5
    |
 LL |     vec_deque.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec_deque.len()`
 
 error: called `.iter().count()` on a `HashSet`
-  --> $DIR/iter_count.rs:57:5
+  --> $DIR/iter_count.rs:58:5
    |
 LL |     hash_set.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `hash_set.len()`
 
 error: called `.iter().count()` on a `HashMap`
-  --> $DIR/iter_count.rs:58:5
+  --> $DIR/iter_count.rs:59:5
    |
 LL |     hash_map.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `hash_map.len()`
 
 error: called `.iter().count()` on a `BTreeMap`
-  --> $DIR/iter_count.rs:59:5
+  --> $DIR/iter_count.rs:60:5
    |
 LL |     b_tree_map.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b_tree_map.len()`
 
 error: called `.iter().count()` on a `BTreeSet`
-  --> $DIR/iter_count.rs:60:5
+  --> $DIR/iter_count.rs:61:5
    |
 LL |     b_tree_set.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b_tree_set.len()`
 
 error: called `.iter().count()` on a `LinkedList`
-  --> $DIR/iter_count.rs:61:5
+  --> $DIR/iter_count.rs:62:5
    |
 LL |     linked_list.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `linked_list.len()`
 
 error: called `.iter().count()` on a `BinaryHeap`
-  --> $DIR/iter_count.rs:62:5
+  --> $DIR/iter_count.rs:63:5
    |
 LL |     binary_heap.iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `binary_heap.len()`
 
 error: called `.iter_mut().count()` on a `Vec`
-  --> $DIR/iter_count.rs:64:5
+  --> $DIR/iter_count.rs:65:5
    |
 LL |     vec.iter_mut().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.len()`
 
 error: called `.iter_mut().count()` on a `slice`
-  --> $DIR/iter_count.rs:65:14
+  --> $DIR/iter_count.rs:66:6
    |
-LL |     let _ = &vec[..].iter_mut().count();
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec[..].len()`
+LL |     &vec[..].iter_mut().count();
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec[..].len()`
 
 error: called `.iter_mut().count()` on a `VecDeque`
-  --> $DIR/iter_count.rs:66:5
+  --> $DIR/iter_count.rs:67:5
    |
 LL |     vec_deque.iter_mut().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec_deque.len()`
 
 error: called `.iter_mut().count()` on a `HashMap`
-  --> $DIR/iter_count.rs:67:5
+  --> $DIR/iter_count.rs:68:5
    |
 LL |     hash_map.iter_mut().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `hash_map.len()`
 
 error: called `.iter_mut().count()` on a `BTreeMap`
-  --> $DIR/iter_count.rs:68:5
+  --> $DIR/iter_count.rs:69:5
    |
 LL |     b_tree_map.iter_mut().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b_tree_map.len()`
 
 error: called `.iter_mut().count()` on a `LinkedList`
-  --> $DIR/iter_count.rs:69:5
+  --> $DIR/iter_count.rs:70:5
    |
 LL |     linked_list.iter_mut().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `linked_list.len()`
 
 error: called `.into_iter().count()` on a `slice`
-  --> $DIR/iter_count.rs:71:14
+  --> $DIR/iter_count.rs:72:6
    |
-LL |     let _ = &vec[..].into_iter().count();
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec[..].len()`
+LL |     &vec[..].into_iter().count();
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec[..].len()`
 
 error: called `.into_iter().count()` on a `Vec`
-  --> $DIR/iter_count.rs:72:5
+  --> $DIR/iter_count.rs:73:5
    |
 LL |     vec.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.len()`
 
 error: called `.into_iter().count()` on a `VecDeque`
-  --> $DIR/iter_count.rs:73:5
+  --> $DIR/iter_count.rs:74:5
    |
 LL |     vec_deque.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec_deque.len()`
 
 error: called `.into_iter().count()` on a `HashSet`
-  --> $DIR/iter_count.rs:74:5
+  --> $DIR/iter_count.rs:75:5
    |
 LL |     hash_set.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `hash_set.len()`
 
 error: called `.into_iter().count()` on a `HashMap`
-  --> $DIR/iter_count.rs:75:5
+  --> $DIR/iter_count.rs:76:5
    |
 LL |     hash_map.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `hash_map.len()`
 
 error: called `.into_iter().count()` on a `BTreeMap`
-  --> $DIR/iter_count.rs:76:5
+  --> $DIR/iter_count.rs:77:5
    |
 LL |     b_tree_map.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b_tree_map.len()`
 
 error: called `.into_iter().count()` on a `BTreeSet`
-  --> $DIR/iter_count.rs:77:5
+  --> $DIR/iter_count.rs:78:5
    |
 LL |     b_tree_set.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b_tree_set.len()`
 
 error: called `.into_iter().count()` on a `LinkedList`
-  --> $DIR/iter_count.rs:78:5
+  --> $DIR/iter_count.rs:79:5
    |
 LL |     linked_list.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `linked_list.len()`
 
 error: called `.into_iter().count()` on a `BinaryHeap`
-  --> $DIR/iter_count.rs:79:5
+  --> $DIR/iter_count.rs:80:5
    |
 LL |     binary_heap.into_iter().count();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `binary_heap.len()`
diff --git a/tests/ui/nonminimal_bool.stderr b/tests/ui/nonminimal_bool.stderr
index 1d39bce935d..bb93cbbd5e1 100644
--- a/tests/ui/nonminimal_bool.stderr
+++ b/tests/ui/nonminimal_bool.stderr
@@ -50,10 +50,10 @@ LL |     let _ = a == b && c == 5 && a == b;
    |
 help: try
    |
-LL |     let _ = a == b && c == 5;
-   |             ~~~~~~~~~~~~~~~~
 LL |     let _ = !(a != b || c != 5);
    |             ~~~~~~~~~~~~~~~~~~~
+LL |     let _ = a == b && c == 5;
+   |             ~~~~~~~~~~~~~~~~
 
 error: this boolean expression can be simplified
   --> $DIR/nonminimal_bool.rs:28:13
@@ -63,10 +63,10 @@ LL |     let _ = a == b || c == 5 || a == b;
    |
 help: try
    |
-LL |     let _ = a == b || c == 5;
-   |             ~~~~~~~~~~~~~~~~
 LL |     let _ = !(a != b && c != 5);
    |             ~~~~~~~~~~~~~~~~~~~
+LL |     let _ = a == b || c == 5;
+   |             ~~~~~~~~~~~~~~~~
 
 error: this boolean expression can be simplified
   --> $DIR/nonminimal_bool.rs:29:13
@@ -76,10 +76,10 @@ LL |     let _ = a == b && c == 5 && b == a;
    |
 help: try
    |
-LL |     let _ = a == b && c == 5;
-   |             ~~~~~~~~~~~~~~~~
 LL |     let _ = !(a != b || c != 5);
    |             ~~~~~~~~~~~~~~~~~~~
+LL |     let _ = a == b && c == 5;
+   |             ~~~~~~~~~~~~~~~~
 
 error: this boolean expression can be simplified
   --> $DIR/nonminimal_bool.rs:30:13
@@ -89,10 +89,10 @@ LL |     let _ = a != b || !(a != b || c == d);
    |
 help: try
    |
-LL |     let _ = a != b || c != d;
-   |             ~~~~~~~~~~~~~~~~
 LL |     let _ = !(a == b && c == d);
    |             ~~~~~~~~~~~~~~~~~~~
+LL |     let _ = a != b || c != d;
+   |             ~~~~~~~~~~~~~~~~
 
 error: this boolean expression can be simplified
   --> $DIR/nonminimal_bool.rs:31:13
@@ -102,10 +102,10 @@ LL |     let _ = a != b && !(a != b && c == d);
    |
 help: try
    |
-LL |     let _ = a != b && c != d;
-   |             ~~~~~~~~~~~~~~~~
 LL |     let _ = !(a == b || c == d);
    |             ~~~~~~~~~~~~~~~~~~~
+LL |     let _ = a != b && c != d;
+   |             ~~~~~~~~~~~~~~~~
 
 error: aborting due to 12 previous errors