diff --git a/spec/core_functions/global/meta.hrx b/spec/core_functions/global/meta.hrx
index cda938d11..753caa4e9 100644
--- a/spec/core_functions/global/meta.hrx
+++ b/spec/core_functions/global/meta.hrx
@@ -16,6 +16,16 @@ a {
   b: true;
 }
 
+<===> feature_exists/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+2 | a {b: meta.feature-exists(at-error)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 2:7  root stylesheet
+
 <===>
 ================================================================================
 <===> variable_exists/input.scss
diff --git a/spec/core_functions/meta/feature_exists.hrx b/spec/core_functions/meta/feature_exists.hrx
index 58a9748a6..baea58012 100644
--- a/spec/core_functions/meta/feature_exists.hrx
+++ b/spec/core_functions/meta/feature_exists.hrx
@@ -13,6 +13,16 @@ a {
   b: true;
 }
 
+<===> global_variable_shadowing/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(global-variable-shadowing)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> extend_selector_pseudoclass/input.scss
@@ -24,6 +34,16 @@ a {
   b: true;
 }
 
+<===> extend_selector_pseudoclass/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(extend-selector-pseudoclass)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> units_level_3/input.scss
@@ -35,6 +55,16 @@ a {
   b: true;
 }
 
+<===> units_level_3/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(units-level-3)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> at_error/input.scss
@@ -46,6 +76,16 @@ a {
   b: true;
 }
 
+<===> at_error/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(at-error)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> custom_property/input.scss
@@ -57,6 +97,16 @@ a {
   b: true;
 }
 
+<===> custom_property/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(custom-property)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> unknown/input.scss
@@ -68,6 +118,16 @@ a {
   b: false;
 }
 
+<===> unknown/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(unknown)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> dash_sensitive/input.scss
@@ -79,6 +139,16 @@ a {
   b: false;
 }
 
+<===> dash_sensitive/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(at_error)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> quote_insensitive/input.scss
@@ -90,6 +160,16 @@ a {
   b: true;
 }
 
+<===> quote_insensitive/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists("at-error")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> named/input.scss
@@ -101,6 +181,16 @@ a {
   b: true;
 }
 
+<===> named/warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists($feature: at-error)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 <===>
 ================================================================================
 <===> error/type/input.scss
@@ -108,6 +198,15 @@ a {
 a {b: meta.feature-exists(1)}
 
 <===> error/type/error
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | a {b: feature-exists(1)}
+  |       ^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:7  root stylesheet
+
 Error: $feature: 1 is not a string.
   ,
 2 | a {b: meta.feature-exists(1)}
diff --git a/spec/libsass-closed-issues/issue_702.hrx b/spec/libsass-closed-issues/issue_702.hrx
index bf4cf7a34..f7f495a22 100644
--- a/spec/libsass-closed-issues/issue_702.hrx
+++ b/spec/libsass-closed-issues/issue_702.hrx
@@ -10,3 +10,13 @@
   content: true;
   content: false;
 }
+
+<===> warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+3 |   content: feature-exists("foo");
+  |            ^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 3:12  root stylesheet
diff --git a/spec/libsass/at-error/feature-test.hrx b/spec/libsass/at-error/feature-test.hrx
index f19c31889..812943710 100644
--- a/spec/libsass/at-error/feature-test.hrx
+++ b/spec/libsass/at-error/feature-test.hrx
@@ -10,3 +10,13 @@
 div {
   feature: true;
 }
+
+<===> warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | @if feature-exists(at-error) {
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:5  root stylesheet
diff --git a/spec/libsass/units/feature-test.hrx b/spec/libsass/units/feature-test.hrx
index ba99f2e14..ce4c8bf28 100644
--- a/spec/libsass/units/feature-test.hrx
+++ b/spec/libsass/units/feature-test.hrx
@@ -10,3 +10,13 @@
 div {
   feature: true;
 }
+
+<===> warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | @if feature-exists(units-level-3) {
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:5  root stylesheet
diff --git a/spec/libsass/variable-scoping/feature-test.hrx b/spec/libsass/variable-scoping/feature-test.hrx
index 47881aebe..4c0f0da92 100644
--- a/spec/libsass/variable-scoping/feature-test.hrx
+++ b/spec/libsass/variable-scoping/feature-test.hrx
@@ -9,3 +9,13 @@
 div {
   feature: true;
 }
+
+<===> warning
+DEPRECATION WARNING: The feature-exists() function is deprecated.
+More info: https://sass-lang.com/d/feature-exists
+
+  ,
+1 | @if feature-exists(global-variable-shadowing) {
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+    input.scss 1:5  root stylesheet