diff --git a/pkg/linter/lib/src/rules/document_ignores.dart b/pkg/linter/lib/src/rules/document_ignores.dart
index 51c1cbfb0a8..b3022d30f9d 100644
--- a/pkg/linter/lib/src/rules/document_ignores.dart
+++ b/pkg/linter/lib/src/rules/document_ignores.dart
@@ -5,7 +5,10 @@
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/src/ignore_comments/ignore_info.dart' // ignore: implementation_imports
-    show CommentTokenExtension, CompilationUnitExtension, IgnoredDiagnosticComment;
+    show
+        CommentTokenExtension,
+        CompilationUnitExtension,
+        IgnoredDiagnosticComment;
 import 'package:analyzer/src/utilities/extensions/string.dart' // ignore: implementation_imports
     show IntExtension;
 
@@ -25,19 +28,21 @@ class DocumentIgnores extends LintRule {
     NodeLintRegistry registry,
     LinterContext context,
   ) {
-    var visitor = _Visitor(this);
+    var visitor = _Visitor(this, context);
     registry.addCompilationUnit(this, visitor);
   }
 }
 
 class _Visitor extends SimpleAstVisitor<void> {
   final LintRule rule;
+  final LinterContext context;
 
-  _Visitor(this.rule);
+  _Visitor(this.rule, this.context);
 
   @override
   void visitCompilationUnit(CompilationUnit node) {
-    var content = node.declaredFragment?.source.contents.data;
+    assert(context.currentUnit?.unit == node);
+    var content = context.currentUnit?.content;
     for (var comment in node.ignoreComments) {
       var ignoredElements = comment.ignoredElements;
       if (ignoredElements.isEmpty) {
diff --git a/pkg/linter/lib/src/rules/lines_longer_than_80_chars.dart b/pkg/linter/lib/src/rules/lines_longer_than_80_chars.dart
index 7bd8e96d753..49d6728769b 100644
--- a/pkg/linter/lib/src/rules/lines_longer_than_80_chars.dart
+++ b/pkg/linter/lib/src/rules/lines_longer_than_80_chars.dart
@@ -161,6 +161,8 @@ class _Visitor extends SimpleAstVisitor<void> {
     var lineInfo = node.lineInfo;
     var lineCount = lineInfo.lineCount;
     var longLines = <_LineInfo>[];
+    assert(context.currentUnit?.unit == node);
+    var content = context.currentUnit?.content;
     for (var i = 0; i < lineCount; i++) {
       var start = lineInfo.getOffsetOfLine(i);
       int end;
@@ -170,7 +172,6 @@ class _Visitor extends SimpleAstVisitor<void> {
         end = lineInfo.getOffsetOfLine(i + 1) - 1;
         var length = end - start;
         if (length > 80) {
-          var content = node.declaredFragment?.source.contents.data;
           if (content != null &&
               content[end] == _lf &&
               content[end - 1] == _cr) {