diff --git a/js-api-spec/value/boolean.test.ts b/js-api-spec/value/boolean.test.ts
index c830e8f259..2d2dd98c2e 100644
--- a/js-api-spec/value/boolean.test.ts
+++ b/js-api-spec/value/boolean.test.ts
@@ -30,6 +30,7 @@ describe('Sass boolean', () => {
       expect(value.assertFunction).toThrow();
       expect(value.assertMap).toThrow();
       expect(value.tryMap()).toBe(null);
+      expect(value.assertMixin).toThrow();
       expect(value.assertNumber).toThrow();
       expect(value.assertString).toThrow();
     });
@@ -60,6 +61,7 @@ describe('Sass boolean', () => {
       expect(value.assertFunction).toThrow();
       expect(value.assertMap).toThrow();
       expect(value.tryMap()).toBe(null);
+      expect(value.assertMixin).toThrow();
       expect(value.assertNumber).toThrow();
       expect(value.assertString).toThrow();
     });
diff --git a/js-api-spec/value/calculation.test.ts b/js-api-spec/value/calculation.test.ts
index b738ed10de..2990b9c319 100644
--- a/js-api-spec/value/calculation.test.ts
+++ b/js-api-spec/value/calculation.test.ts
@@ -48,6 +48,7 @@ describe('SassCalculation', () => {
       expect(() => calculation.assertFunction()).toThrow();
       expect(() => calculation.assertMap()).toThrow();
       expect(calculation.tryMap()).toBe(null);
+      expect(() => calculation.assertMixin()).toThrow();
       expect(() => calculation.assertNumber()).toThrow();
       expect(() => calculation.assertString()).toThrow();
     });
diff --git a/js-api-spec/value/color.test.ts b/js-api-spec/value/color.test.ts
index 1a6c6bfa21..c816c67c7c 100644
--- a/js-api-spec/value/color.test.ts
+++ b/js-api-spec/value/color.test.ts
@@ -57,6 +57,7 @@ describe('SassColor', () => {
         expect(() => color.assertFunction()).toThrow();
         expect(() => color.assertMap()).toThrow();
         expect(color.tryMap()).toBe(null);
+        expect(() => color.assertMixin()).toThrow();
         expect(() => color.assertNumber()).toThrow();
         expect(() => color.assertString()).toThrow();
       });
diff --git a/js-api-spec/value/list.test.ts b/js-api-spec/value/list.test.ts
index e7d784fcad..930ef01d9f 100644
--- a/js-api-spec/value/list.test.ts
+++ b/js-api-spec/value/list.test.ts
@@ -30,6 +30,7 @@ describe('SassList', () => {
       expect(() => list.assertFunction()).toThrow();
       expect(() => list.assertMap()).toThrow();
       expect(list.tryMap()).toBe(null);
+      expect(() => list.assertMixin()).toThrow();
       expect(() => list.assertNumber()).toThrow();
       expect(() => list.assertString()).toThrow();
     });
@@ -358,6 +359,7 @@ describe('SassList', () => {
       expect(() => list.assertCalculation()).toThrow();
       expect(() => list.assertColor()).toThrow();
       expect(() => list.assertFunction()).toThrow();
+      expect(() => list.assertMixin()).toThrow();
       expect(() => list.assertNumber()).toThrow();
       expect(() => list.assertString()).toThrow();
     });
diff --git a/js-api-spec/value/map.test.ts b/js-api-spec/value/map.test.ts
index 36a3716a31..c185b00d03 100644
--- a/js-api-spec/value/map.test.ts
+++ b/js-api-spec/value/map.test.ts
@@ -32,6 +32,7 @@ describe('SassMap', () => {
       expect(() => map.assertCalculation()).toThrow();
       expect(() => map.assertColor()).toThrow();
       expect(() => map.assertFunction()).toThrow();
+      expect(() => map.assertMixin()).toThrow();
       expect(() => map.assertNumber()).toThrow();
       expect(() => map.assertString()).toThrow();
     });
diff --git a/js-api-spec/value/mixin.test.ts b/js-api-spec/value/mixin.test.ts
new file mode 100644
index 0000000000..a1413bfa8f
--- /dev/null
+++ b/js-api-spec/value/mixin.test.ts
@@ -0,0 +1,46 @@
+// Copyright 2021 Google Inc. Use of this source code is governed by an
+// MIT-style license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+import {SassMixin, compileString} from 'sass';
+
+import {spy} from '../utils';
+
+it('can round-trip a mixin reference from Sass', () => {
+  const fn = spy(args => {
+    expect(args).toBeArrayOfSize(1);
+    const value = args[0];
+    expect(value).toBeInstanceOf(SassMixin);
+    expect(value.assertCalculation).toThrow();
+    expect(value.assertColor).toThrow();
+    expect(value.assertFunction).toThrow();
+    expect(value.assertMap).toThrow();
+    expect(value.tryMap()).toBe(null);
+    expect(value.assertMixin()).toBe(value);
+    expect(value.assertNumber).toThrow();
+    expect(value.assertString).toThrow();
+
+    return value;
+  });
+
+  expect(
+    compileString(
+      `
+      @use 'sass:meta';
+
+      @mixin a() {
+        a {
+          b: c;
+        }
+      }
+
+      @include meta.apply(foo(meta.get-mixin('a')));
+    `,
+      {
+        functions: {'foo($arg)': fn},
+      }
+    ).css
+  ).toBe('a {\n  b: c;\n}');
+
+  expect(fn).toHaveBeenCalled();
+});
diff --git a/js-api-spec/value/null.test.ts b/js-api-spec/value/null.test.ts
index 2ed3d37df9..dcfbe13c52 100644
--- a/js-api-spec/value/null.test.ts
+++ b/js-api-spec/value/null.test.ts
@@ -30,6 +30,7 @@ describe('Sass null', () => {
     expect(value.assertFunction).toThrow();
     expect(value.assertMap).toThrow();
     expect(value.tryMap()).toBe(null);
+    expect(value.assertMixin).toThrow();
     expect(value.assertNumber).toThrow();
     expect(value.assertString).toThrow();
   });
diff --git a/js-api-spec/value/number.test.ts b/js-api-spec/value/number.test.ts
index f2493821be..00656a375d 100644
--- a/js-api-spec/value/number.test.ts
+++ b/js-api-spec/value/number.test.ts
@@ -42,6 +42,7 @@ describe('Sass number', () => {
           expect(() => number.assertFunction()).toThrow();
           expect(() => number.assertMap()).toThrow();
           expect(number.tryMap()).toBe(null);
+          expect(() => number.assertMixin()).toThrow();
           expect(() => number.assertString()).toThrow();
         });
       });
diff --git a/js-api-spec/value/string.test.ts b/js-api-spec/value/string.test.ts
index abe4fc2135..061089529b 100644
--- a/js-api-spec/value/string.test.ts
+++ b/js-api-spec/value/string.test.ts
@@ -59,6 +59,7 @@ describe('Sass string', () => {
       expect(value.assertFunction).toThrow();
       expect(value.assertMap).toThrow();
       expect(value.tryMap()).toBe(null);
+      expect(value.assertMixin).toThrow();
       expect(value.assertNumber).toThrow();
     });
   });
diff --git a/spec/core_functions/meta/accepts_content.hrx b/spec/core_functions/meta/accepts_content.hrx
new file mode 100644
index 0000000000..b25a1b8624
--- /dev/null
+++ b/spec/core_functions/meta/accepts_content.hrx
@@ -0,0 +1,138 @@
+<===> options.yml
+---
+:todo:
+- sass/libsass#2807
+
+<===>
+================================================================================
+<===> accepts/direct_child/input.scss
+@use "sass:meta";
+
+@mixin a() {@content}
+
+a {b: meta.accepts-content(meta.get-mixin("a"))}
+
+<===> accepts/direct_child/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> accepts/nested_child/input.scss
+@use "sass:meta";
+
+@mixin a() {
+  @if false {@content}
+}
+
+a {b: meta.accepts-content(meta.get-mixin("a"))}
+
+<===> accepts/nested_child/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> accepts/builtin/input.scss
+@use "sass:meta";
+
+a {b: meta.accepts-content(meta.get-mixin(apply, meta))}
+
+<===> accepts/builtin/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> doesnt_accept/empty/input.scss
+@use "sass:meta";
+@mixin a() {}
+
+a {b: meta.accepts-content(meta.get-mixin("a"))}
+
+<===> doesnt_accept/empty/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> doesnt_accept/builtin/input.scss
+@use "sass:meta";
+@mixin a() {}
+
+a {b: meta.accepts-content(meta.get-mixin(load-css, meta))}
+
+<===> doesnt_accept/builtin/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> args/keyword/input.scss
+@use "sass:meta";
+
+a {b: meta.accepts-content($mixin: meta.get-mixin(apply, meta))}
+
+<===> args/keyword/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> error/args/too_few/input.scss
+@use "sass:meta";
+
+a {b: meta.accepts-content()}
+
+<===> error/args/too_few/error
+Error: Missing argument $mixin.
+  ,--> input.scss
+3 | a {b: meta.accepts-content()}
+  |       ^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function accepts-content($mixin) {
+  |           ======================= declaration
+  '
+  input.scss 3:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/args/too_many/input.scss
+@use "sass:meta";
+@mixin a() {}
+
+a {b: meta.accepts-content(a, a)}
+
+<===> error/args/too_many/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,--> input.scss
+4 | a {b: meta.accepts-content(a, a)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function accepts-content($mixin) {
+  |           ======================= declaration
+  '
+  input.scss 4:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/args/wrong_type/input.scss
+@use "sass:meta";
+
+a {b: meta.accepts-content(meta.get-function("red"))}
+
+<===> error/args/wrong_type/error
+Error: $mixin: get-function("red") is not a mixin reference.
+  ,
+3 | a {b: meta.accepts-content(meta.get-function("red"))}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 3:7  root stylesheet
diff --git a/spec/core_functions/meta/apply.hrx b/spec/core_functions/meta/apply.hrx
new file mode 100644
index 0000000000..f7a5aaf40f
--- /dev/null
+++ b/spec/core_functions/meta/apply.hrx
@@ -0,0 +1,275 @@
+<===> options.yml
+---
+:todo:
+- sass/libsass#2807
+
+<===>
+================================================================================
+<===> args/named/input.scss
+@use "sass:meta";
+
+@mixin a {
+  b: c;
+}
+
+a {@include meta.apply($mixin: meta.get-mixin("a"))}
+
+<===> args/named/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> args/passes/positional/input.scss
+@use "sass:meta";
+
+@mixin a($a) {b: $a}
+
+a {@include meta.apply(meta.get-mixin("a"), c)}
+
+<===> args/passes/positional/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> args/passes/named/input.scss
+@use "sass:meta";
+
+@mixin a($a) {b: $a}
+
+a {@include meta.apply(meta.get-mixin("a"), $a: c)}
+
+<===> args/passes/named/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> args/passes/rest/positional/input.scss
+@use "sass:meta";
+
+@mixin a($a...) {b: $a}
+
+a {@include meta.apply(meta.get-mixin("a"), a, b, c)}
+
+<===> args/passes/rest/positional/output.css
+a {
+  b: a, b, c;
+}
+
+<===>
+================================================================================
+<===> args/passes/rest/named/input.scss
+@use "sass:meta";
+
+@mixin a($a...) {b: meta.inspect(meta.keywords($a))}
+
+a {@include meta.apply(meta.get-mixin("a"), $a: a, $b: b, $c: c)}
+
+<===> args/passes/rest/named/output.css
+a {
+  b: (a: a, b: b, c: c);
+}
+
+<===>
+================================================================================
+<===> rest/mixin-separate/positional/input.scss
+@use "sass:meta";
+
+@mixin a($a, $b) {b: $a, $b}
+
+$rest: 1 2;
+a {@include meta.apply(meta.get-mixin("a"), $rest...)}
+
+<===> rest/mixin-separate/positional/output.css
+a {
+  b: 1, 2;
+}
+
+<===>
+================================================================================
+<===> rest/mixin-separate/named/input.scss
+@use "sass:meta";
+
+@mixin a($a, $b) {b: $a, $b}
+
+$rest: (a: 1, b: 2);
+a {@include meta.apply(meta.get-mixin("a"), $rest...)}
+
+<===> rest/mixin-separate/named/output.css
+a {
+  b: 1, 2;
+}
+
+<===>
+================================================================================
+<===> rest/includes-mixin/positional/input.scss
+@use "sass:meta";
+
+@mixin a($a, $b) {b: $a, $b}
+
+$rest: meta.get-mixin("a") 1 2;
+a {@include meta.apply($rest...)}
+
+<===> rest/includes-mixin/positional/output.css
+a {
+  b: 1, 2;
+}
+
+<===>
+================================================================================
+<===> rest/includes-mixin/named/input.scss
+@use "sass:meta";
+
+@mixin a($a, $b) {b: $a, $b}
+
+$rest: (mixin: meta.get-mixin("a"), a: 1, b: 2);
+a {@include meta.apply($rest...)}
+
+<===> rest/includes-mixin/named/output.css
+a {
+  b: 1, 2;
+}
+
+<===>
+================================================================================
+<===> error/wrong_named_arg/input.scss
+@use "sass:meta";
+
+@mixin a($a) {b: $a}
+
+a {@include meta.apply(meta.get-mixin("a"), $b: c)}
+
+<===> error/wrong_named_arg/error
+Error: Missing argument $a.
+    ,
+3   | @mixin a($a) {b: $a}
+    |        ===== declaration
+... |
+5   | a {@include meta.apply(meta.get-mixin("a"), $b: c)}
+    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+    '
+  input.scss 5:4  a()
+  input.scss 5:4  root stylesheet
+
+<===>
+================================================================================
+<===> error/use_as_function/input.scss
+@use "sass:meta";
+
+@mixin a {}
+$a: meta.get-mixin("a");
+
+a {b: meta.apply($a)}
+
+<===> error/use_as_function/error
+Error: Undefined function.
+  ,
+6 | a {b: meta.apply($a)}
+  |       ^^^^^^^^^^^^^^
+  '
+  input.scss 6:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/no_args/input.scss
+@use "sass:meta";
+
+a {@include meta.apply()}
+
+<===> error/no_args/error
+Error: Missing argument $mixin.
+  ,--> input.scss
+3 | a {@include meta.apply()}
+  |    ^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @mixin apply($mixin, $args...) {
+  |        ======================= declaration
+  '
+  input.scss 3:4  root stylesheet
+
+<===>
+================================================================================
+<===> error/wrong_arg_type/input.scss
+@use "sass:meta";
+
+a {@include meta.apply(2px)}
+
+<===> error/wrong_arg_type/error
+Error: $mixin: 2px is not a mixin reference.
+  ,
+3 | a {@include meta.apply(2px)}
+  |    ^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 3:4  root stylesheet
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+@use "sass:meta";
+
+@mixin a {}
+$a: meta.get-mixin("a");
+
+a {@include meta.apply($a, 2px)}
+
+<===> error/too_many_args/error
+Error: Only 0 arguments allowed, but 1 was passed.
+    ,
+3   | @mixin a {}
+    |        = declaration
+... |
+6   | a {@include meta.apply($a, 2px)}
+    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+    '
+  input.scss 6:4  a()
+  input.scss 6:4  root stylesheet
+
+<===>
+================================================================================
+<===> error/missing_mixin_args/input.scss
+@use "sass:meta";
+
+@mixin a($a) {}
+$a: meta.get-mixin("a");
+
+a {@include meta.apply($a)}
+
+<===> error/missing_mixin_args/error
+Error: Missing argument $a.
+    ,
+3   | @mixin a($a) {}
+    |        ===== declaration
+... |
+6   | a {@include meta.apply($a)}
+    |    ^^^^^^^^^^^^^^^^^^^^^^^ invocation
+    '
+  input.scss 6:4  a()
+  input.scss 6:4  root stylesheet
+
+<===>
+================================================================================
+<===> error/too_many_args_mixin_accepts_args/input.scss
+@use "sass:meta";
+
+@mixin a($a) {}
+$a: meta.get-mixin("a");
+
+a {@include meta.apply($a, 2px, 3px)}
+
+<===> error/too_many_args_mixin_accepts_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+    ,
+3   | @mixin a($a) {}
+    |        ===== declaration
+... |
+6   | a {@include meta.apply($a, 2px, 3px)}
+    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+    '
+  input.scss 6:4  a()
+  input.scss 6:4  root stylesheet
diff --git a/spec/core_functions/meta/get_mixin/content.hrx b/spec/core_functions/meta/get_mixin/content.hrx
new file mode 100644
index 0000000000..ee2afbea36
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/content.hrx
@@ -0,0 +1,168 @@
+<===> passes_content/input.scss
+@use "sass:meta";
+
+@mixin a {
+  b {@content}
+}
+
+a {
+  @include meta.apply(meta.get-mixin("a")) {
+    b: red;
+  }
+}
+
+<===> passes_content/output.css
+a b {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> passes_empty_content/input.scss
+@use "sass:meta";
+
+@mixin a {@content;}
+
+a {
+  @include meta.apply(meta.get-mixin("a")) {}
+}
+
+<===> passes_empty_content/output.css
+
+<===>
+================================================================================
+<===> scope/redeclare/vars/input.scss
+@use "sass:meta";
+@mixin a($param: param) {
+  $in-mixin: in-mixin;
+  @content;
+  param: $param;
+  in-mixin: $in-mixin;
+}
+
+$global: global;
+
+a {
+  $in-style-rule: in-style-rule;
+  @include meta.apply(meta.get-mixin("a")) {
+    $param: in-include;
+    $in-mixin: in-include;
+    $global: in-include;
+    $in-style-rule: in-include;
+  }
+  global: $global;
+  in-style-rule: $in-style-rule;
+}
+
+<===> scope/redeclare/vars/output.css
+a {
+  param: param;
+  in-mixin: in-mixin;
+  global: global;
+  in-style-rule: in-include;
+}
+
+<===>
+================================================================================
+<===> scope/redeclare/using/input.scss
+@use "sass:meta";
+@mixin a($a: param) {@content(content-arg);}
+
+$a: global;
+
+a {
+  $a: in-style-rule;
+  @include meta.apply(meta.get-mixin("a")) using ($a) {
+    in-content-body: $a;
+    $a: in-content-body;
+  }
+  in-style-rule: $a;
+}
+
+<===> scope/redeclare/using/output.css
+a {
+  in-content-body: content-arg;
+  in-style-rule: in-style-rule;
+}
+
+<===>
+================================================================================
+<===> scope/fall_through/input.scss
+@use "sass:meta";
+$global: global;
+
+@mixin a {
+  @content(content-rule-a);
+  global: $global;
+}
+
+@mixin b {
+  $global: in-mixin-b;
+  @include meta.apply(meta.get-mixin(a)) using ($content-arg) {
+    @content($content-arg);
+  }
+}
+
+@mixin c {
+  $global: in-mixin-c;
+  @include meta.apply(meta.get-mixin(b)) using ($content-arg) {
+    @content($content-arg);
+  }
+}
+
+a {
+  $global: in-style-rule;
+  @include meta.apply(meta.get-mixin(c)) using ($content-arg) {
+    in-content-body: $content-arg;
+  }
+}
+
+<===> scope/fall_through/output.css
+a {
+  in-content-body: content-rule-a;
+  global: global;
+}
+
+<===>
+================================================================================
+<===> error/denies_content/user_defined/input.scss
+@use "sass:meta";
+@mixin a {}
+
+a {
+  @include meta.apply(meta.get-mixin("a")) {}
+}
+
+<===> error/denies_content/user_defined/error
+Error: Mixin doesn't accept a content block.
+    ,
+2   | @mixin a {}
+    |        = declaration
+... |
+5   |   @include meta.apply(meta.get-mixin("a")) {}
+    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+    '
+  input.scss 5:3  root stylesheet
+
+<===>
+================================================================================
+<===> error/denies_content/builtin/input.scss
+@use "sass:meta";
+
+a {
+  @include meta.apply(meta.get-mixin(load-css, meta), "a") {
+    a: b;
+  }
+}
+
+<===> error/denies_content/builtin/error
+Error: Mixin doesn't accept a content block.
+  ,--> input.scss
+4 |   @include meta.apply(meta.get-mixin(load-css, meta), "a") {
+  |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @mixin load-css($url, $with: null) {
+  |        =========================== declaration
+  '
+  input.scss 4:3  root stylesheet
diff --git a/spec/core_functions/meta/get_mixin/different_module.hrx b/spec/core_functions/meta/get_mixin/different_module.hrx
new file mode 100644
index 0000000000..a963879124
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/different_module.hrx
@@ -0,0 +1,129 @@
+<===> defined/input.scss
+@use "sass:meta";
+@use "other";
+a {@include meta.apply(meta.get-mixin("a", $module: "other"), #abcdef)}
+
+<===> defined/_other.scss
+@mixin a($color) {b: red($color)}
+
+<===> defined/output.css
+a {
+  b: 171;
+}
+
+<===>
+================================================================================
+<===> chosen_prefix/input.scss
+@use "sass:meta";
+@use "other" as a;
+b {@include meta.apply(meta.get-mixin("a", $module: "a"), #abcdef)}
+
+<===> chosen_prefix/_other.scss
+@mixin a($color) {c: red($color)}
+
+<===> chosen_prefix/output.css
+b {
+  c: 171;
+}
+
+<===>
+================================================================================
+<===> through_use/input.scss
+@use "sass:meta";
+@use "other" as *;
+a {@include meta.apply(meta.get-mixin(add-two), 10)}
+
+<===> through_use/other.scss
+@mixin add-two($v) {b: $v + 2}
+
+<===> through_use/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> through_forward/bare/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c))}
+
+<===> through_forward/bare/_midstream.scss
+@forward "upstream";
+
+<===> through_forward/bare/_upstream.scss
+@mixin c() {b: c}
+
+<===> through_forward/bare/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> through_forward/as/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c-d))}
+
+<===> through_forward/as/_midstream.scss
+@forward "upstream" as c-*;
+
+<===> through_forward/as/_upstream.scss
+@mixin d() {b: d}
+
+<===> through_forward/as/output.css
+a {
+  b: d;
+}
+
+<===>
+================================================================================
+<===> through_forward/show/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(c))}
+
+<===> through_forward/show/_midstream.scss
+@forward "upstream" show c;
+
+<===> through_forward/show/_upstream.scss
+@mixin c() {b: c}
+
+<===> through_forward/show/output.css
+a {
+  b: c;
+}
+
+<===>
+================================================================================
+<===> through_forward/hide/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {@include meta.apply(meta.get-mixin(d))}
+
+<===> through_forward/hide/_midstream.scss
+@forward "upstream" hide c;
+
+<===> through_forward/hide/_upstream.scss
+@mixin d() {b: d}
+
+<===> through_forward/hide/output.css
+a {
+  b: d;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+@use "sass:meta";
+@use "other";
+a {@include meta.apply(meta.get-mixin($name: "a", $module: "other"), #abcdef)}
+
+<===> named/_other.scss
+@mixin a($color) {b: red($color)}
+
+<===> named/output.css
+a {
+  b: 171;
+}
diff --git a/spec/core_functions/meta/get_mixin/equality.hrx b/spec/core_functions/meta/get_mixin/equality.hrx
new file mode 100644
index 0000000000..6e0e0736dc
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/equality.hrx
@@ -0,0 +1,73 @@
+<===> same_value/input.scss
+@use "sass:meta";
+@mixin a() {}
+$a: meta.get-mixin(a);
+a {b: $a == $a}
+
+<===> same_value/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> built_in/same/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(load-css, meta) == meta.get-mixin(load-css, meta)}
+
+<===> built_in/same/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> built_in/different/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(load-css, meta) == meta.get-mixin(apply, meta)}
+
+<===> built_in/different/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> user_defined/same/input.scss
+@use "sass:meta";
+@mixin user-defined() {}
+a {b: meta.get-mixin(user-defined) == meta.get-mixin(user-defined)}
+
+<===> user_defined/same/output.css
+a {
+  b: true;
+}
+
+<===>
+================================================================================
+<===> user_defined/different/input.scss
+@use "sass:meta";
+@mixin user-defined-1() {}
+@mixin user-defined-2() {}
+a {b: meta.get-mixin(user-defined-1) == meta.get-mixin(user-defined-2)}
+
+<===> user_defined/different/output.css
+a {
+  b: false;
+}
+
+<===>
+================================================================================
+<===> user_defined/redefined/input.scss
+@use "sass:meta";
+@mixin user-defined() {}
+$first-reference: meta.get-mixin(user-defined);
+
+@mixin user-defined() {}
+$second-reference: meta.get-mixin(user-defined);
+a {b: $first-reference == $second-reference}
+
+<===> user_defined/redefined/output.css
+a {
+  b: false;
+}
diff --git a/spec/core_functions/meta/get_mixin/error.hrx b/spec/core_functions/meta/get_mixin/error.hrx
new file mode 100644
index 0000000000..765ed6f078
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/error.hrx
@@ -0,0 +1,224 @@
+<===> argument/type/name/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(2px)}
+
+<===> argument/type/name/error
+Error: $name: 2px is not a string.
+  ,
+2 | a {b: meta.get-mixin(2px)}
+  |       ^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/type/module/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(c, $module: 1)}
+
+<===> argument/type/module/error
+Error: $module: 1 is not a string.
+  ,
+2 | a {b: meta.get-mixin(c, $module: 1)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/mixin_ref/input.scss
+@use "sass:meta";
+@mixin a() {}
+
+$a-ref: meta.get-mixin(a);
+a {b: meta.get-mixin($a-ref)}
+
+<===> argument/mixin_ref/error
+Error: $name: get-mixin("a") is not a string.
+  ,
+5 | a {b: meta.get-mixin($a-ref)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 5:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/too_few/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin()}
+
+<===> argument/too_few/error
+Error: Missing argument $name.
+  ,--> input.scss
+2 | a {b: meta.get-mixin()}
+  |       ^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function get-mixin($name, $module: null) {
+  |           =============================== declaration
+  '
+  input.scss 2:7  root stylesheet
+
+<===>
+================================================================================
+<===> argument/too_many/input.scss
+@use "sass:meta";
+a {b: meta.inspect(meta.get-mixin(c, true, d, e))}
+
+<===> argument/too_many/error
+Error: Only 2 arguments allowed, but 4 were passed.
+  ,--> input.scss
+2 | a {b: meta.inspect(meta.get-mixin(c, true, d, e))}
+  |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function get-mixin($name, $module: null) {
+  |           =============================== declaration
+  '
+  input.scss 2:20  root stylesheet
+
+<===>
+================================================================================
+<===> non_existent/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin(does-not-exist)}
+
+<===> non_existent/error
+Error: Mixin not found: does-not-exist
+  ,
+2 | a {b: meta.get-mixin(does-not-exist)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:7  root stylesheet
+
+<===>
+================================================================================
+<===> through_forward/show/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {
+  @include meta.apply(meta.get-mixin(d));
+}
+
+<===> through_forward/show/_midstream.scss
+@forward "upstream" show c;
+
+<===> through_forward/show/_upstream.scss
+@mixin d() {a: c}
+
+<===> through_forward/show/error
+Error: Mixin not found: d
+  ,
+4 |   @include meta.apply(meta.get-mixin(d));
+  |                       ^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:23  root stylesheet
+
+<===>
+================================================================================
+<===> through_forward/hide/input.scss
+@use "sass:meta";
+@use "midstream" as *;
+a {
+  @include meta.apply(meta.get-mixin(c));
+}
+
+<===> through_forward/hide/_midstream.scss
+@forward "upstream" hide c;
+
+<===> through_forward/hide/_upstream.scss
+@mixin c() {a: c}
+
+<===> through_forward/hide/error
+Error: Mixin not found: c
+  ,
+4 |   @include meta.apply(meta.get-mixin(c));
+  |                       ^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:23  root stylesheet
+
+<===>
+================================================================================
+<===> conflict/input.scss
+@use "sass:meta";
+@use "other1" as *;
+@use "other2" as *;
+
+a {b: meta.get-mixin(member)}
+
+<===> conflict/other1.scss
+@mixin member() {a: other1}
+
+<===> conflict/other2.scss
+@mixin member() {a: other2}
+
+<===> conflict/error
+Error: This mixin is available from multiple global modules.
+    ,
+2   | @use "other1" as *;
+    | ================== includes mixin
+3   | @use "other2" as *;
+    | ================== includes mixin
+... |
+5   | a {b: meta.get-mixin(member)}
+    |       ^^^^^^^^^^^^^^^^^^^^^^ mixin use
+    '
+  input.scss 5:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/undefined/input.scss
+@use "sass:meta";
+@use "sass:color";
+a {b: meta.get-mixin("c", $module: "color")}
+
+<===> module/undefined/error
+Error: Mixin not found: "c"
+  ,
+3 | a {b: meta.get-mixin("c", $module: "color")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 3:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/non_existent/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin("c", $module: "d")}
+
+<===> module/non_existent/error
+Error: There is no module with the namespace "d".
+  ,
+2 | a {b: meta.get-mixin("c", $module: "d")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/built_in_but_not_loaded/input.scss
+@use "sass:meta";
+a {b: meta.get-mixin("red", $module: "color")}
+
+<===> module/built_in_but_not_loaded/error
+Error: There is no module with the namespace "color".
+  ,
+2 | a {b: meta.get-mixin("red", $module: "color")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:7  root stylesheet
+
+<===>
+================================================================================
+<===> module/dash_sensitive/input.scss
+@use "sass:meta";
+@use "sass:color" as a-b;
+c {d: meta.get-mixin("c", $module: "a_b")}
+
+<===> module/dash_sensitive/error
+Error: There is no module with the namespace "a_b".
+  ,
+3 | c {d: meta.get-mixin("c", $module: "a_b")}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 3:7  root stylesheet
diff --git a/spec/core_functions/meta/get_mixin/options.yml b/spec/core_functions/meta/get_mixin/options.yml
new file mode 100644
index 0000000000..3f54c5effb
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/options.yml
@@ -0,0 +1,3 @@
+---
+:todo:
+- sass/libsass#2807
diff --git a/spec/core_functions/meta/get_mixin/same_module.hrx b/spec/core_functions/meta/get_mixin/same_module.hrx
new file mode 100644
index 0000000000..288396a841
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/same_module.hrx
@@ -0,0 +1,71 @@
+<===> user_defined/input.scss
+@use "sass:meta";
+@mixin add-two($v) {b: $v + 2}
+$add-two-mixin: meta.get-mixin(add-two);
+
+a {@include meta.apply($add-two-mixin, 10)}
+
+<===> user_defined/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> redefined/input.scss
+@use "sass:meta";
+@mixin add-two($v) {b: $v + 2}
+$add-two-mixin: meta.get-mixin(add-two);
+
+// The mixin returned by `meta.get-mixin()` is locked in place when it's
+// called. Redefining the mixin after the fact shouldn't affect the stored
+// value.
+@mixin add-two($v) {@error "Should not be called"}
+
+a {@include meta.apply($add-two-mixin, 10)}
+
+<===> redefined/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> through_import/input.scss
+@use "sass:meta";
+@import "other";
+a {@include meta.apply(meta.get-mixin(add-two), 10)}
+
+<===> through_import/other.scss
+@mixin add-two($v) {b: $v + 2}
+
+<===> through_import/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> dash_insensitive/dash_to_underscore/input.scss
+@use "sass:meta";
+@mixin add_two($v) {b: $v + 2}
+
+a {@include meta.apply(meta.get-mixin(add-two), 10)}
+
+<===> dash_insensitive/dash_to_underscore/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> dash_insensitive/underscore_to_dash/input.scss
+@use "sass:meta";
+@mixin add-two($v) {b: $v + 2}
+
+a {@include meta.apply(meta.get-mixin(add_two), 10)}
+
+<===> dash_insensitive/underscore_to_dash/output.css
+a {
+  b: 12;
+}
diff --git a/spec/core_functions/meta/get_mixin/scope.hrx b/spec/core_functions/meta/get_mixin/scope.hrx
new file mode 100644
index 0000000000..253148e845
--- /dev/null
+++ b/spec/core_functions/meta/get_mixin/scope.hrx
@@ -0,0 +1,90 @@
+<===> stores_local_scope/options.yml
+---
+:todo:
+- sass/libsass#2830
+
+<===> stores_local_scope/input.scss
+@use "sass:meta";
+$add-two-mixin: null;
+
+.scope {
+  @mixin add-two($v) {b: $v + 2}
+
+  // This mixin reference will still refer to this nested `add-two` mixin
+  // even when it goes out of scope.
+  $add-two-mixin: get-mixin(add-two) !global;
+}
+
+a {@include meta.apply($add-two-mixin, 10)}
+
+<===> stores_local_scope/output.css
+a {
+  b: 12;
+}
+
+<===>
+================================================================================
+<===> captures_inner_scope/input.scss
+@use "sass:meta";
+@mixin add-two($v) {@error "Should not be called"}
+.scope1 {
+  @mixin add-two($v) {@error "Should not be called"}
+  .scope2 {
+    @mixin add-two($v) {@error "Should not be called"}
+    .scope3 {
+      @mixin add-two($v) {a: $v + 2}
+
+      // Like a normal mixin call, get-mixin() will always use the
+      // innermost definition of a mixin.
+      @include meta.apply(get-mixin(add-two), 10);
+    }
+  }
+}
+
+<===> captures_inner_scope/output.css
+.scope1 .scope2 .scope3 {
+  a: 12;
+}
+
+<===>
+================================================================================
+<===> scope/mutated_global/input.scss
+@use "sass:meta";
+$a: x;
+
+@mixin a {a: $a}
+
+$ref: meta.get-mixin("a");
+
+$a: y;
+
+a {@include meta.apply($ref);}
+
+<===> scope/mutated_global/output.css
+a {
+  a: y;
+}
+
+<===>
+================================================================================
+<===> scope/mutated_local/input.scss
+@use "sass:meta";
+
+a {
+  $a: x;
+
+  @mixin a {
+    a: $a;
+  }
+
+  $ref: meta.get-mixin("a");
+
+  $a: y;
+  @include meta.apply($ref);
+}
+
+<===> scope/mutated_local/output.css
+a {
+  a: y;
+}
+
diff --git a/spec/core_functions/meta/inspect/mixin.hrx b/spec/core_functions/meta/inspect/mixin.hrx
new file mode 100644
index 0000000000..2a891f049b
--- /dev/null
+++ b/spec/core_functions/meta/inspect/mixin.hrx
@@ -0,0 +1,27 @@
+<===> options.yml
+---
+:todo:
+- sass/libsass#2807
+
+<===>
+================================================================================
+<===> user_defined/input.scss
+@use "sass:meta";
+@mixin a() {}
+a {b: inspect(meta.get-mixin(a))};
+
+<===> user_defined/output.css
+a {
+  b: get-mixin("a");
+}
+
+<===>
+================================================================================
+<===> builtin/input.scss
+@use "sass:meta";
+a {b: inspect(meta.get-mixin(load-css, meta))};
+
+<===> builtin/output.css
+a {
+  b: get-mixin("load-css");
+}
diff --git a/spec/core_functions/meta/load_css/error/content.hrx b/spec/core_functions/meta/load_css/error/content.hrx
new file mode 100644
index 0000000000..49fda0c865
--- /dev/null
+++ b/spec/core_functions/meta/load_css/error/content.hrx
@@ -0,0 +1,17 @@
+<===> input.scss
+@use "sass:meta";
+@include meta.load-css("other") {};
+
+<===> _other.scss
+
+<===> error
+Error: Mixin doesn't accept a content block.
+  ,--> input.scss
+2 | @include meta.load-css("other") {};
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @mixin load-css($url, $with: null) {
+  |        =========================== declaration
+  '
+  input.scss 2:1  root stylesheet
diff --git a/spec/core_functions/meta/module_mixins.hrx b/spec/core_functions/meta/module_mixins.hrx
new file mode 100644
index 0000000000..edcdac0ec3
--- /dev/null
+++ b/spec/core_functions/meta/module_mixins.hrx
@@ -0,0 +1,400 @@
+<===> options.yml
+---
+:todo:
+- sass/libsass#2807
+
+<===> _utils.scss
+@use "sass:meta";
+
+@mixin print-mixin-map($mixins) {
+  a {
+    @each $name, $mixin in $mixins {
+      #{$name}: {@include meta.apply($mixin)};
+    }
+  }
+}
+
+<===>
+================================================================================
+<===> empty/input.scss
+@use "sass:meta";
+@use "other";
+
+a {b: meta.inspect(meta.module-mixins("other"))}
+
+<===> empty/_other.scss
+// This module defines no mixins.
+
+<===> empty/output.css
+a {
+  b: ();
+}
+
+<===>
+================================================================================
+<===> return_type/user_defined/input.scss
+@use "sass:meta";
+@use "other";
+
+a {b: meta.type-of(meta.module-mixins("other"))}
+
+<===> return_type/user_defined/_other.scss
+// This module defines no mixins.
+
+<===> return_type/user_defined/output.css
+a {
+  b: map;
+}
+
+<===>
+================================================================================
+<===> return_type/builtin/input.scss
+@use "sass:meta";
+
+a {b: meta.type-of(meta.module-mixins("meta"))}
+
+<===> return_type/builtin/output.css
+a {
+  b: map;
+}
+
+<===>
+================================================================================
+<===> multiple/input.scss
+@use "sass:meta";
+@use "core_functions/meta/module_mixins/utils";
+@use "other";
+
+@include utils.print-mixin-map(meta.module-mixins("other"));
+
+<===> multiple/_other.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> multiple/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> dash_sensitive/input.scss
+@use "sass:meta";
+@use "core_functions/meta/module_mixins/utils";
+@use "other";
+
+@include utils.print-mixin-map(meta.module-mixins("other"));
+
+<===> dash_sensitive/_other.scss
+@mixin b-c() {b-c: value}
+@mixin d_e() {d_e: value}
+
+<===> dash_sensitive/output.css
+a {
+  b-c-b-c: value;
+  d-e-d_e: value;
+}
+
+<===>
+================================================================================
+<===> as/input.scss
+@use "sass:meta";
+@use "core_functions/meta/module_mixins/utils";
+@use "other" as b;
+
+@include utils.print-mixin-map(meta.module-mixins("b"))
+
+<===> as/_other.scss
+@mixin c() {c: value}
+@mixin d() {d: value}
+@mixin e() {e: value}
+
+<===> as/output.css
+a {
+  c-c: value;
+  d-d: value;
+  e-e: value;
+}
+
+<===>
+================================================================================
+<===> through_import/input.scss
+@use "sass:meta";
+@use "core_functions/meta/module_mixins/utils";
+@use "used";
+
+@include utils.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_import/_used.scss
+@import "imported";
+
+<===> through_import/_imported.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_import/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> core_module/input.scss
+@use "sass:map";
+@use "sass:meta";
+
+// We don't want to print every mixin name in this module, since that would
+// make this test brittle when new mixins are added. Instead we just test
+// that a couple mixins work.
+
+$mixins: meta.module-mixins("meta");
+a {
+  load-css-exists: map.has-key($mixins, "load-css");
+}
+
+<===> core_module/output.css
+a {
+  load-css-exists: true;
+}
+
+<===>
+================================================================================
+<===> through_forward/bare/input.scss
+@use "sass:meta";
+@use "../../utils";
+@use "used";
+
+@include utils.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/bare/_used.scss
+@forward "forwarded";
+
+<===> through_forward/bare/_forwarded.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_forward/bare/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> through_forward/as/input.scss
+@use "sass:meta";
+@use "../../utils";
+@use "used";
+
+@include utils.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/as/_used.scss
+@forward "forwarded" as b-*;
+
+<===> through_forward/as/_forwarded.scss
+@mixin c() {c: value}
+@mixin d() {d: value}
+@mixin e() {e: value}
+
+<===> through_forward/as/output.css
+a {
+  b-c-c: value;
+  b-d-d: value;
+  b-e-e: value;
+}
+
+<===>
+================================================================================
+<===> through_forward/show/input.scss
+@use "sass:meta";
+@use "../../utils";
+@use "used";
+
+@include utils.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/show/_used.scss
+@forward "forwarded" show b, c;
+
+<===> through_forward/show/_forwarded.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_forward/show/output.css
+a {
+  b-b: value;
+  c-c: value;
+}
+
+<===>
+================================================================================
+<===> through_forward/hide/input.scss
+@use "sass:meta";
+@use "../../utils";
+@use "used";
+
+@include utils.print-mixin-map(meta.module-mixins("used"));
+
+<===> through_forward/hide/_used.scss
+@forward "forwarded" hide b, c;
+
+<===> through_forward/hide/_forwarded.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> through_forward/hide/output.css
+a {
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+@use "sass:meta";
+@use "core_functions/meta/module_mixins/utils";
+@use "other";
+
+@include utils.print-mixin-map(meta.module-mixins($module: "other"));
+
+<===> named/_other.scss
+@mixin b() {b: value}
+@mixin c() {c: value}
+@mixin d() {d: value}
+
+<===> named/output.css
+a {
+  b-b: value;
+  c-c: value;
+  d-d: value;
+}
+
+<===>
+================================================================================
+<===> error/type/input.scss
+@use "sass:meta";
+$a: meta.module-mixins(1);
+
+<===> error/type/error
+Error: $module: 1 is not a string.
+  ,
+2 | $a: meta.module-mixins(1);
+  |     ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+@use "sass:meta";
+$a: meta.module-mixins();
+
+<===> error/too_few_args/error
+Error: Missing argument $module.
+  ,--> input.scss
+2 | $a: meta.module-mixins();
+  |     ^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function module-mixins($module) {
+  |           ====================== declaration
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+@use "sass:meta";
+$a: meta.module-mixins("meta", "c");
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,--> input.scss
+2 | $a: meta.module-mixins("meta", "c");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
+  '
+  ,--> sass:meta
+1 | @function module-mixins($module) {
+  |           ====================== declaration
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/missing/input.scss
+@use "sass:meta";
+$a: meta.module-mixins("other");
+
+<===> error/missing/error
+Error: There is no module with namespace "other".
+  ,
+2 | $a: meta.module-mixins("other");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 2:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/dash_sensitive/input.scss
+@use "sass:meta";
+@use "other-module";
+
+$a: meta.module-mixins("other_module");
+
+<===> error/dash_sensitive/_other-module.scss
+// This module defines no mixins.
+
+<===> error/dash_sensitive/error
+Error: There is no module with namespace "other_module".
+  ,
+4 | $a: meta.module-mixins("other_module");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/global/input.scss
+@use "sass:meta";
+@use "other" as *;
+
+$a: meta.module-mixins("other");
+
+<===> error/global/_other.scss
+// This module defines no mixins.
+
+<===> error/global/error
+Error: There is no module with namespace "other".
+  ,
+4 | $a: meta.module-mixins("other");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:5  root stylesheet
+
+<===>
+================================================================================
+<===> error/before_load/input.scss
+@use "sass:meta";
+
+$a: meta.module-mixins("other");
+
+@use "other";
+
+<===> error/before_load/_other.scss
+// This module defines no mixins.
+
+<===> error/before_load/error
+Error: There is no module with namespace "other".
+  ,
+3 | $a: meta.module-mixins("other");
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 3:5  root stylesheet
diff --git a/spec/core_functions/meta/type_of.hrx b/spec/core_functions/meta/type_of.hrx
index 45b5379a64..6355989e83 100644
--- a/spec/core_functions/meta/type_of.hrx
+++ b/spec/core_functions/meta/type_of.hrx
@@ -177,6 +177,36 @@ a {
   b: calculation;
 }
 
+<===>
+================================================================================
+<===> mixin/options.yml
+---
+:todo:
+- sass/libsass#2807
+
+<===>
+================================================================================
+<===> mixin/user_defined/input.scss
+@use "sass:meta";
+@mixin a() {}
+a {b: type-of(meta.get-mixin(a))}
+
+<===> mixin/user_defined/output.css
+a {
+  b: mixin;
+}
+
+<===>
+================================================================================
+<===> mixin/builtin/input.scss
+@use "sass:meta";
+a {b: type-of(meta.get-mixin(load-css, meta))}
+
+<===> mixin/builtin/output.css
+a {
+  b: mixin;
+}
+
 <===>
 ================================================================================
 <===> named/input.scss
diff --git a/spec/libsass-closed-issues/issue_1079.hrx b/spec/libsass-closed-issues/issue_1079.hrx
index 8946c1e177..3a6ba16ba3 100644
--- a/spec/libsass-closed-issues/issue_1079.hrx
+++ b/spec/libsass-closed-issues/issue_1079.hrx
@@ -2,9 +2,13 @@
 #{hdr(2,5)} { color: #08c; }
 <===> error
 Error: expected selector.
-  ,
+  ,--> input.scss
 1 | #{hdr(2,5)} { color: #08c; }
-  |   ^^^^^^^^
+  |   ^^^^^^^^ 
+  '
+  ,
+1 | hdr(2, 5) 
+  |    = error in interpolated output
   '
   input.scss 1:3  root stylesheet
 
diff --git a/spec/values/mixins.hrx b/spec/values/mixins.hrx
new file mode 100644
index 0000000000..fdc6029d8e
--- /dev/null
+++ b/spec/values/mixins.hrx
@@ -0,0 +1,84 @@
+<===> options.yml
+---
+:todo:
+- sass/libsass#2807
+
+<===>
+================================================================================
+<===> error/addition/input.scss
+@use "sass:meta";
+@mixin a() {}
+@mixin b() {}
+a {b: meta.get-mixin(a) + meta.get-mixin(b)}
+
+<===> error/addition/error
+Error: get-mixin("a") isn't a valid CSS value.
+  ,
+4 | a {b: meta.get-mixin(a) + meta.get-mixin(b)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/subtraction/input.scss
+@use "sass:meta";
+@mixin a() {}
+@mixin b() {}
+a {b: meta.get-mixin(a) - meta.get-mixin(b)}
+
+<===> error/subtraction/error
+Error: get-mixin("a") isn't a valid CSS value.
+  ,
+4 | a {b: meta.get-mixin(a) - meta.get-mixin(b)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/multiplication/input.scss
+@use "sass:meta";
+@mixin a() {}
+@mixin b() {}
+a {b: meta.get-mixin(a) * meta.get-mixin(b)}
+
+<===> error/multiplication/error
+Error: Undefined operation "get-mixin("a") * get-mixin("b")".
+  ,
+4 | a {b: meta.get-mixin(a) * meta.get-mixin(b)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/division/input.scss
+@use "sass:meta";
+@mixin a() {}
+@mixin b() {}
+a {b: meta.get-mixin(a) / meta.get-mixin(b)}
+
+<===> error/division/error
+Error: get-mixin("a") isn't a valid CSS value.
+  ,
+4 | a {b: meta.get-mixin(a) / meta.get-mixin(b)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/modulo/input.scss
+@use "sass:meta";
+@mixin a() {}
+@mixin b() {}
+a {b: meta.get-mixin(a) % meta.get-mixin(b)}
+
+<===> error/modulo/error
+Error: Undefined operation "get-mixin("a") % get-mixin("b")".
+  ,
+4 | a {b: meta.get-mixin(a) % meta.get-mixin(b)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 4:7  root stylesheet