diff --git a/grammars/csharp.tmLanguage b/grammars/csharp.tmLanguage
index 6b6a385..9d66b73 100644
--- a/grammars/csharp.tmLanguage
+++ b/grammars/csharp.tmLanguage
@@ -4799,9 +4799,12 @@
         <key>begin</key>
         <string>(?x)
 (?:
-  (?:(\bref)\s+(?:(\breadonly)\s+)?)?(\bvar\b)| # ref local
+  (?:(\bscoped)\s+(?:(\bref)\s+)?)?    # scoped local
+  (?:(\bref)\s+(?:(\breadonly)\s+)?)?  # ref local
+  (\bvar\b)|
   (?&lt;type_name&gt;
     (?:
+      (?:scoped\s+(?:ref\s+)?)?     # scoped local
       (?:ref\s+(?:readonly\s+)?)?   # ref local
       (?:
         (?:(?&lt;identifier&gt;@?[_[:alpha:]][_[:alnum:]]*)\s*\:\:\s*)? # alias-qualification
@@ -4832,19 +4835,29 @@
           <key>1</key>
           <dict>
             <key>name</key>
-            <string>storage.modifier.ref.cs</string>
+            <string>storage.modifier.scoped.cs</string>
           </dict>
           <key>2</key>
           <dict>
             <key>name</key>
-            <string>storage.modifier.readonly.cs</string>
+            <string>storage.modifier.ref.cs</string>
           </dict>
           <key>3</key>
           <dict>
             <key>name</key>
-            <string>storage.type.var.cs</string>
+            <string>storage.modifier.ref.cs</string>
           </dict>
           <key>4</key>
+          <dict>
+            <key>name</key>
+            <string>storage.modifier.readonly.cs</string>
+          </dict>
+          <key>5</key>
+          <dict>
+            <key>name</key>
+            <string>storage.type.var.cs</string>
+          </dict>
+          <key>6</key>
           <dict>
             <key>patterns</key>
             <array>
@@ -4854,7 +4867,7 @@
               </dict>
             </array>
           </dict>
-          <key>9</key>
+          <key>11</key>
           <dict>
             <key>name</key>
             <string>entity.name.variable.local.cs</string>
@@ -7284,7 +7297,7 @@
       <dict>
         <key>match</key>
         <string>(?x)
-(?:(?:\b(ref|params|out|in|this)\b)\s+)?
+(?:(?:\b(scoped|ref|params|out|in|this)\b)\s+)?
 (?&lt;type_name&gt;
   (?:
     (?:ref\s+)?   # ref return
@@ -8204,6 +8217,10 @@
             <key>include</key>
             <string>#comment</string>
           </dict>
+          <dict>
+            <key>include</key>
+            <string>#scoped-modifier</string>
+          </dict>
           <dict>
             <key>include</key>
             <string>#ref-modifier</string>
@@ -8242,6 +8259,13 @@
           </dict>
         </array>
       </dict>
+      <key>scoped-modifier</key>
+      <dict>
+        <key>name</key>
+        <string>storage.modifier.scoped.cs</string>
+        <key>match</key>
+        <string>\bscoped\b</string>
+      </dict>
       <key>ref-modifier</key>
       <dict>
         <key>name</key>
diff --git a/grammars/csharp.tmLanguage.cson b/grammars/csharp.tmLanguage.cson
index 3f09e3e..86263bf 100644
--- a/grammars/csharp.tmLanguage.cson
+++ b/grammars/csharp.tmLanguage.cson
@@ -2931,9 +2931,12 @@ repository:
     begin: '''
       (?x)
       (?:
-        (?:(\\bref)\\s+(?:(\\breadonly)\\s+)?)?(\\bvar\\b)| # ref local
+        (?:(\\bscoped)\\s+(?:(\\bref)\\s+)?)?    # scoped local
+        (?:(\\bref)\\s+(?:(\\breadonly)\\s+)?)?  # ref local
+        (\\bvar\\b)|
         (?<type_name>
           (?:
+            (?:scoped\\s+(?:ref\\s+)?)?     # scoped local
             (?:ref\\s+(?:readonly\\s+)?)?   # ref local
             (?:
               (?:(?<identifier>@?[_[:alpha:]][_[:alnum:]]*)\\s*\\:\\:\\s*)? # alias-qualification
@@ -2962,18 +2965,22 @@ repository:
     '''
     beginCaptures:
       "1":
-        name: "storage.modifier.ref.cs"
+        name: "storage.modifier.scoped.cs"
       "2":
-        name: "storage.modifier.readonly.cs"
+        name: "storage.modifier.ref.cs"
       "3":
-        name: "storage.type.var.cs"
+        name: "storage.modifier.ref.cs"
       "4":
+        name: "storage.modifier.readonly.cs"
+      "5":
+        name: "storage.type.var.cs"
+      "6":
         patterns: [
           {
             include: "#type"
           }
         ]
-      "9":
+      "11":
         name: "entity.name.variable.local.cs"
     end: "(?=[;)}])"
     patterns: [
@@ -4393,7 +4400,7 @@ repository:
   parameter:
     match: '''
       (?x)
-      (?:(?:\\b(ref|params|out|in|this)\\b)\\s+)?
+      (?:(?:\\b(scoped|ref|params|out|in|this)\\b)\\s+)?
       (?<type_name>
         (?:
           (?:ref\\s+)?   # ref return
@@ -4961,6 +4968,9 @@ repository:
       {
         include: "#comment"
       }
+      {
+        include: "#scoped-modifier"
+      }
       {
         include: "#ref-modifier"
       }
@@ -4989,6 +4999,9 @@ repository:
         include: "#type-pointer-suffix"
       }
     ]
+  "scoped-modifier":
+    name: "storage.modifier.scoped.cs"
+    match: "\\bscoped\\b"
   "ref-modifier":
     name: "storage.modifier.ref.cs"
     match: "\\bref\\b"
diff --git a/src/csharp.tmLanguage.yml b/src/csharp.tmLanguage.yml
index 360b7d2..d99b878 100644
--- a/src/csharp.tmLanguage.yml
+++ b/src/csharp.tmLanguage.yml
@@ -1739,9 +1739,12 @@ repository:
     begin: |-
       (?x)
       (?:
-        (?:(\bref)\s+(?:(\breadonly)\s+)?)?(\bvar\b)| # ref local
+        (?:(\bscoped)\s+(?:(\bref)\s+)?)?    # scoped local
+        (?:(\bref)\s+(?:(\breadonly)\s+)?)?  # ref local
+        (\bvar\b)|
         (?<type_name>
           (?:
+            (?:scoped\s+(?:ref\s+)?)?     # scoped local
             (?:ref\s+(?:readonly\s+)?)?   # ref local
             (?:
               (?:(?<identifier>@?[_[:alpha:]][_[:alnum:]]*)\s*\:\:\s*)? # alias-qualification
@@ -1768,17 +1771,19 @@ repository:
       (?!=>)
       (?=,|;|=|\))
     beginCaptures:
-      1: { name: storage.modifier.ref.cs }
-      2: { name: storage.modifier.readonly.cs }
-      3: { name: storage.type.var.cs }
-      4:
+      1: { name: storage.modifier.scoped.cs }
+      2: { name: storage.modifier.ref.cs }
+      3: { name: storage.modifier.ref.cs }
+      4: { name: storage.modifier.readonly.cs }
+      5: { name: storage.type.var.cs }
+      6:
         patterns:
         - include: '#type'
-      # 5: ?<identifier> is a sub-expression. It's final value is not considered.
-      # 6: ?<name_and_type_args> is a sub-expression. It's final value is not considered.
-      # 7: ?<type_args> is a sub-expression. It's final value is not considered.
-      # 8: ?<tuple> is a sub-expression. It's final value is not considered.
-      9: { name: entity.name.variable.local.cs }
+      # 7: ?<identifier> is a sub-expression. It's final value is not considered.
+      # 8: ?<name_and_type_args> is a sub-expression. It's final value is not considered.
+      # 9: ?<type_args> is a sub-expression. It's final value is not considered.
+      # 10: ?<tuple> is a sub-expression. It's final value is not considered.
+      11: { name: entity.name.variable.local.cs }
     end: (?=[;)}])
     patterns:
     - name: entity.name.variable.local.cs
@@ -2829,7 +2834,7 @@ repository:
   parameter:
     match: |-
       (?x)
-      (?:(?:\b(ref|params|out|in|this)\b)\s+)?
+      (?:(?:\b(scoped|ref|params|out|in|this)\b)\s+)?
       (?<type_name>
         (?:
           (?:ref\s+)?   # ref return
@@ -3226,6 +3231,7 @@ repository:
   type:
     patterns:
     - include: '#comment'
+    - include: '#scoped-modifier'
     - include: '#ref-modifier'
     - include: '#readonly-modifier'
     - include: '#tuple-type'
@@ -3236,6 +3242,10 @@ repository:
     - include: '#type-nullable-suffix'
     - include: '#type-pointer-suffix'
 
+  scoped-modifier:
+    name: storage.modifier.scoped.cs
+    match: \bscoped\b
+
   ref-modifier:
     name: storage.modifier.ref.cs
     match: \bref\b
diff --git a/test/local.tests.ts b/test/local.tests.ts
index 9b342c4..4077bf3 100644
--- a/test/local.tests.ts
+++ b/test/local.tests.ts
@@ -96,6 +96,79 @@ describe("Locals", () => {
             ]);
         });
 
+        it("scoped local", async () => {
+            const input = Input.InMethod(`scoped Span<int> x = stackalloc int[42];`);
+            const tokens = await tokenize(input);
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Scoped,
+                Token.Type("Span"),
+                Token.Punctuation.TypeParameter.Begin,
+                Token.PrimitiveType.Int,
+                Token.Punctuation.TypeParameter.End,
+                Token.Identifier.LocalName("x"),
+                Token.Operator.Assignment,
+                Token.Operator.Expression.StackAlloc,
+                Token.PrimitiveType.Int,
+                Token.Punctuation.OpenBracket,
+                Token.Literal.Numeric.Decimal("42"),
+                Token.Punctuation.CloseBracket,
+                Token.Punctuation.Semicolon
+            ]);
+        });
+
+        it("scoped local var", async () => {
+            const input = Input.InMethod(`scoped var x = y;`);
+            const tokens = await tokenize(input);
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Scoped,
+                Token.Keyword.Definition.Var,
+                Token.Identifier.LocalName("x"),
+                Token.Operator.Assignment,
+                Token.Variable.ReadWrite("y"),
+                Token.Punctuation.Semicolon
+            ]);
+        });
+
+        it("scoped ref local", async () => {
+            const input = Input.InMethod(`scoped ref Span<int> x = stackalloc int[42];`);
+            const tokens = await tokenize(input);
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Scoped,
+                Token.Keyword.Modifier.Ref,
+                Token.Type("Span"),
+                Token.Punctuation.TypeParameter.Begin,
+                Token.PrimitiveType.Int,
+                Token.Punctuation.TypeParameter.End,
+                Token.Identifier.LocalName("x"),
+                Token.Operator.Assignment,
+                Token.Operator.Expression.StackAlloc,
+                Token.PrimitiveType.Int,
+                Token.Punctuation.OpenBracket,
+                Token.Literal.Numeric.Decimal("42"),
+                Token.Punctuation.CloseBracket,
+                Token.Punctuation.Semicolon
+            ]);
+        });
+
+        it("scoped ref local var", async () => {
+            const input = Input.InMethod(`scoped ref var x = ref y;`);
+            const tokens = await tokenize(input);
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Scoped,
+                Token.Keyword.Modifier.Ref,
+                Token.Keyword.Definition.Var,
+                Token.Identifier.LocalName("x"),
+                Token.Operator.Assignment,
+                Token.Keyword.Modifier.Ref,
+                Token.Variable.ReadWrite("y"),
+                Token.Punctuation.Semicolon
+            ]);
+        });
+
         it("ref local", async () => {
             const input = Input.InMethod(`ref int x;`);
             const tokens = await tokenize(input);
diff --git a/test/method.tests.ts b/test/method.tests.ts
index ad90879..edaba0b 100644
--- a/test/method.tests.ts
+++ b/test/method.tests.ts
@@ -796,6 +796,67 @@ public void LinearRegression(double[,] samples, double[] standardDeviations, int
             ]);
         });
 
+        it("ref parameter in parameter list", async () => {
+            const input = Input.InClass(`
+public static Span<T> CreateSpan<T>(ref T reference, int length) {}
+`);
+            const tokens = await tokenize(input);
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Public,
+                Token.Keyword.Modifier.Static,
+                Token.Type("Span"),
+                Token.Punctuation.TypeParameter.Begin,
+                Token.Type("T"),
+                Token.Punctuation.TypeParameter.End,
+                Token.Identifier.MethodName("CreateSpan"),
+                Token.Punctuation.TypeParameter.Begin,
+                Token.Identifier.TypeParameterName("T"),
+                Token.Punctuation.TypeParameter.End,
+                Token.Punctuation.OpenParen,
+                Token.Keyword.Modifier.Ref,
+                Token.Type("T"),
+                Token.Identifier.ParameterName("reference"),
+                Token.Punctuation.Comma,
+                Token.PrimitiveType.Int,
+                Token.Identifier.ParameterName("length"),
+                Token.Punctuation.CloseParen,
+                Token.Punctuation.OpenBrace,
+                Token.Punctuation.CloseBrace
+            ]);
+        });
+
+        it("scoped ref parameter in parameter list (#306)", async () => {
+            const input = Input.InClass(`
+public static Span<T> CreateSpan<T>(scoped ref T reference, int length) {}
+`);
+            const tokens = await tokenize(input);
+
+            tokens.should.deep.equal([
+                Token.Keyword.Modifier.Public,
+                Token.Keyword.Modifier.Static,
+                Token.Type("Span"),
+                Token.Punctuation.TypeParameter.Begin,
+                Token.Type("T"),
+                Token.Punctuation.TypeParameter.End,
+                Token.Identifier.MethodName("CreateSpan"),
+                Token.Punctuation.TypeParameter.Begin,
+                Token.Identifier.TypeParameterName("T"),
+                Token.Punctuation.TypeParameter.End,
+                Token.Punctuation.OpenParen,
+                Token.Keyword.Modifier.Scoped,
+                Token.Keyword.Modifier.Ref,
+                Token.Type("T"),
+                Token.Identifier.ParameterName("reference"),
+                Token.Punctuation.Comma,
+                Token.PrimitiveType.Int,
+                Token.Identifier.ParameterName("length"),
+                Token.Punctuation.CloseParen,
+                Token.Punctuation.OpenBrace,
+                Token.Punctuation.CloseBrace
+            ]);
+        });
+
         it("expression body and type constraint (issue #74)", async () => {
             const input = Input.InClass(`
 T id1<T>(T a) => a;
diff --git a/test/utils/tokenize.ts b/test/utils/tokenize.ts
index 71f950d..e032e35 100644
--- a/test/utils/tokenize.ts
+++ b/test/utils/tokenize.ts
@@ -355,6 +355,7 @@ export namespace Token {
             export const ReadOnly = createToken('readonly', 'storage.modifier.readonly.cs');
             export const Ref = createToken('ref', 'storage.modifier.ref.cs');
             export const Required = createToken('required', 'storage.modifier.required.cs');
+            export const Scoped = createToken('scoped', 'storage.modifier.scoped.cs');
             export const Sealed = createToken('sealed', 'storage.modifier.sealed.cs');
             export const Static = createToken('static', 'storage.modifier.static.cs');
             export const This = createToken('this', 'storage.modifier.this.cs');