improve source location of block scope with invalid ast

src/analysis.zig

@@ -2692,9 +2692,20 @@ fn makeScopeInternal(context: ScopeContext, node_idx: Ast.Node.Index) error{OutO
         .block_two_semicolon,
         => {
             const first_token = tree.firstToken(node_idx);
+            const last_token = ast.lastToken(tree, node_idx);
+
+            // the last token may not always be the closing brace because of broken ast
+            // so we look at most 16 characters ahead to find the closing brace
+            // TODO this should automatically be done by `ast.lastToken`
+            var end_index = offsets.tokenToLoc(tree, last_token).start;
+            const lookahead_buffer = tree.source[end_index..@min(tree.source.len, end_index + 16)];
+            end_index += std.mem.indexOfScalar(u8, lookahead_buffer, '}') orelse 0;
 
             const scope_index = try context.pushScope(
-                offsets.nodeToLoc(tree, node_idx),
+                .{
+                    .start = offsets.tokenToIndex(tree, main_tokens[node_idx]),
+                    .end = end_index,
+                },
                 .{ .block = node_idx },
             );
             defer context.popScope();