diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index d4f9122e7e3..e288a43c0e0 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -1443,9 +1443,8 @@ impl CheckCfg {
         let relocation_model_values = RelocModel::all();
 
         // Unknown possible values:
-        //  - `feature`
         //  - `target_feature`
-        for name in [sym::feature, sym::target_feature] {
+        for name in [sym::target_feature] {
             self.expecteds.entry(name).or_insert(ExpectedValues::Any);
         }
 
diff --git a/tests/ui/check-cfg/allow-same-level.stderr b/tests/ui/check-cfg/allow-same-level.stderr
index b0c459fabf8..19d9443d477 100644
--- a/tests/ui/check-cfg/allow-same-level.stderr
+++ b/tests/ui/check-cfg/allow-same-level.stderr
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `FALSE`
 LL | #[cfg(FALSE)]
    |       ^^^^^
    |
-   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/check-cfg/compact-names.stderr b/tests/ui/check-cfg/compact-names.stderr
index b0228774b75..ffde972a25e 100644
--- a/tests/ui/check-cfg/compact-names.stderr
+++ b/tests/ui/check-cfg/compact-names.stderr
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `target_architecture`
 LL | #[cfg(target(os = "linux", architecture = "arm"))]
    |                            ^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/check-cfg/exhaustive-names-values.empty_cfg.stderr b/tests/ui/check-cfg/exhaustive-names-values.empty_cfg.stderr
index 12a055d02a7..971abb1a21a 100644
--- a/tests/ui/check-cfg/exhaustive-names-values.empty_cfg.stderr
+++ b/tests/ui/check-cfg/exhaustive-names-values.empty_cfg.stderr
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
 LL | #[cfg(unknown_key = "value")]
    |       ^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition value: `value`
@@ -17,5 +17,17 @@ LL | #[cfg(test = "value")]
    |
    = note: no expected value for `test`
 
-warning: 2 warnings emitted
+warning: unexpected `cfg` condition name: `feature`
+  --> $DIR/exhaustive-names-values.rs:19:7
+   |
+LL | #[cfg(feature = "unk")]
+   |       ^^^^^^^^^^^^^^^
+
+warning: unexpected `cfg` condition name: `feature`
+  --> $DIR/exhaustive-names-values.rs:26:7
+   |
+LL | #[cfg(feature = "std")]
+   |       ^^^^^^^^^^^^^^^
+
+warning: 4 warnings emitted
 
diff --git a/tests/ui/check-cfg/exhaustive-names-values.empty_names_values.stderr b/tests/ui/check-cfg/exhaustive-names-values.empty_names_values.stderr
index 12a055d02a7..971abb1a21a 100644
--- a/tests/ui/check-cfg/exhaustive-names-values.empty_names_values.stderr
+++ b/tests/ui/check-cfg/exhaustive-names-values.empty_names_values.stderr
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
 LL | #[cfg(unknown_key = "value")]
    |       ^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition value: `value`
@@ -17,5 +17,17 @@ LL | #[cfg(test = "value")]
    |
    = note: no expected value for `test`
 
-warning: 2 warnings emitted
+warning: unexpected `cfg` condition name: `feature`
+  --> $DIR/exhaustive-names-values.rs:19:7
+   |
+LL | #[cfg(feature = "unk")]
+   |       ^^^^^^^^^^^^^^^
+
+warning: unexpected `cfg` condition name: `feature`
+  --> $DIR/exhaustive-names-values.rs:26:7
+   |
+LL | #[cfg(feature = "std")]
+   |       ^^^^^^^^^^^^^^^
+
+warning: 4 warnings emitted
 
diff --git a/tests/ui/check-cfg/exhaustive-names-values.rs b/tests/ui/check-cfg/exhaustive-names-values.rs
index ef1e458b249..ceb4831e22d 100644
--- a/tests/ui/check-cfg/exhaustive-names-values.rs
+++ b/tests/ui/check-cfg/exhaustive-names-values.rs
@@ -17,11 +17,15 @@ pub fn f() {}
 pub fn f() {}
 
 #[cfg(feature = "unk")]
-//[feature]~^ WARNING unexpected `cfg` condition value
-//[full]~^^ WARNING unexpected `cfg` condition value
+//[empty_names_values]~^ WARNING unexpected `cfg` condition name
+//[empty_cfg]~^^ WARNING unexpected `cfg` condition name
+//[feature]~^^^ WARNING unexpected `cfg` condition value
+//[full]~^^^^ WARNING unexpected `cfg` condition value
 pub fn feat() {}
 
 #[cfg(feature = "std")]
+//[empty_names_values]~^ WARNING unexpected `cfg` condition name
+//[empty_cfg]~^^ WARNING unexpected `cfg` condition name
 pub fn feat() {}
 
 #[cfg(windows)]
diff --git a/tests/ui/check-cfg/exhaustive-names.empty_names.stderr b/tests/ui/check-cfg/exhaustive-names.empty_names.stderr
index 6bc7845c832..7d01c73cc09 100644
--- a/tests/ui/check-cfg/exhaustive-names.empty_names.stderr
+++ b/tests/ui/check-cfg/exhaustive-names.empty_names.stderr
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
 LL | #[cfg(unknown_key = "value")]
    |       ^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/check-cfg/exhaustive-names.exhaustive_names.stderr b/tests/ui/check-cfg/exhaustive-names.exhaustive_names.stderr
index 6bc7845c832..7d01c73cc09 100644
--- a/tests/ui/check-cfg/exhaustive-names.exhaustive_names.stderr
+++ b/tests/ui/check-cfg/exhaustive-names.exhaustive_names.stderr
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
 LL | #[cfg(unknown_key = "value")]
    |       ^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/check-cfg/stmt-no-ice.stderr b/tests/ui/check-cfg/stmt-no-ice.stderr
index 900ea4e4da0..3fb3ae27ec4 100644
--- a/tests/ui/check-cfg/stmt-no-ice.stderr
+++ b/tests/ui/check-cfg/stmt-no-ice.stderr
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `crossbeam_loom`
 LL |     #[cfg(crossbeam_loom)]
    |           ^^^^^^^^^^^^^^
    |
-   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: 1 warning emitted
diff --git a/tests/ui/check-cfg/well-known-names.rs b/tests/ui/check-cfg/well-known-names.rs
index 1dcb419b4a7..32c14703d25 100644
--- a/tests/ui/check-cfg/well-known-names.rs
+++ b/tests/ui/check-cfg/well-known-names.rs
@@ -15,6 +15,7 @@ fn target_os() {}
 fn feature_misspell() {}
 
 #[cfg(feature = "foo")]
+//~^ WARNING unexpected `cfg` condition name
 fn feature() {}
 
 #[cfg(uniw)]
diff --git a/tests/ui/check-cfg/well-known-names.stderr b/tests/ui/check-cfg/well-known-names.stderr
index 3001289b7e0..a986e61bcdc 100644
--- a/tests/ui/check-cfg/well-known-names.stderr
+++ b/tests/ui/check-cfg/well-known-names.stderr
@@ -14,15 +14,21 @@ warning: unexpected `cfg` condition name: `features`
   --> $DIR/well-known-names.rs:13:7
    |
 LL | #[cfg(features = "foo")]
-   |       --------^^^^^^^^
-   |       |
-   |       help: there is a config with a similar name: `feature`
+   |       ^^^^^^^^^^^^^^^^
+   |
+   = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
+
+warning: unexpected `cfg` condition name: `feature`
+  --> $DIR/well-known-names.rs:17:7
+   |
+LL | #[cfg(feature = "foo")]
+   |       ^^^^^^^^^^^^^^^
 
 warning: unexpected `cfg` condition name: `uniw`
-  --> $DIR/well-known-names.rs:20:7
+  --> $DIR/well-known-names.rs:21:7
    |
 LL | #[cfg(uniw)]
    |       ^^^^ help: there is a config with a similar name: `unix`
 
-warning: 3 warnings emitted
+warning: 4 warnings emitted