fix semantic tokens on if capture by ref

src/features/semantic_tokens.zig

@@ -516,8 +516,10 @@ fn writeNodeTokens(builder: *Builder, node: Ast.Node.Index) error{OutOfMemory}!v
             try writeToken(builder, if_node.ast.if_token, .keyword);
             try callWriteNodeTokens(allocator, .{ builder, if_node.ast.cond_expr });
 
-            if (if_node.payload_token) |payload| {
+            if (if_node.payload_token) |payload_token| {
-                try writeTokenMod(builder, payload, .variable, .{ .declaration = true });
+                const capture_is_ref = token_tags[payload_token] == .asterisk;
+                const actual_payload = payload_token + @boolToInt(capture_is_ref);
+                try writeTokenMod(builder, actual_payload, .variable, .{ .declaration = true });
             }
             try callWriteNodeTokens(allocator, .{ builder, if_node.ast.then_expr });
 

tests/lsp_features/semantic_tokens.zig

@@ -808,6 +808,16 @@ test "semantic tokens - if" {
         .{ "err", .variable, .{ .declaration = true } },
         .{ "err", .variable, .{} },
     });
+    try testSemanticTokens(
+        \\const foo = if (null) |*value| {};
+    , &.{
+        .{ "const", .keyword, .{} },
+        .{ "foo", .variable, .{ .declaration = true } },
+        .{ "=", .operator, .{} },
+        .{ "if", .keyword, .{} },
+        .{ "null", .keywordLiteral, .{} },
+        .{ "value", .variable, .{ .declaration = true } },
+    });
 }
 
 test "semantic tokens - while" {