Issue 24514. Set documentation range for LibraryElement.

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index a5a99af45a3b921807118aae0db3e91464dbd553..0a7d60176326b5abf7a40c53b1e73daac0f35f57 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -7088,6 +7088,7 @@ class LibraryElementBuilder {
         .buildCompilationUnit(
             librarySource, definingCompilationUnit, librarySource);
     NodeList<Directive> directives = definingCompilationUnit.directives;
+    LibraryDirective libraryDirective = null;
     LibraryIdentifier libraryNameNode = null;
     bool hasPartDirective = false;
     FunctionElement entryPoint =
@@ -7105,6 +7106,7 @@ class LibraryElementBuilder {
       //
       if (directive is LibraryDirective) {
         if (libraryNameNode == null) {
+          libraryDirective = directive;
           libraryNameNode = directive.name;
           directivesToResolve.add(directive);
         }
@@ -7163,6 +7165,7 @@ class LibraryElementBuilder {
     //
     LibraryElementImpl libraryElement = new LibraryElementImpl.forNode(
         _analysisContext.getContextFor(librarySource), libraryNameNode);
+    _setDocRange(libraryElement, libraryDirective);
     libraryElement.definingCompilationUnit = definingCompilationUnitElement;
     if (entryPoint != null) {
       libraryElement.entryPoint = entryPoint;
@@ -7194,6 +7197,7 @@ class LibraryElementBuilder {
         .buildCompilationUnit(
             librarySource, definingCompilationUnit, librarySource);
     NodeList<Directive> directives = definingCompilationUnit.directives;
+    LibraryDirective libraryDirective = null;
     LibraryIdentifier libraryNameNode = null;
     bool hasPartDirective = false;
     FunctionElement entryPoint =
@@ -7211,6 +7215,7 @@ class LibraryElementBuilder {
       //
       if (directive is LibraryDirective) {
         if (libraryNameNode == null) {
+          libraryDirective = directive;
           libraryNameNode = directive.name;
           directivesToResolve.add(directive);
         }
@@ -7271,6 +7276,7 @@ class LibraryElementBuilder {
     //
     LibraryElementImpl libraryElement = new LibraryElementImpl.forNode(
         _analysisContext.getContextFor(librarySource), libraryNameNode);
+    _setDocRange(libraryElement, libraryDirective);
     libraryElement.definingCompilationUnit = definingCompilationUnitElement;
     if (entryPoint != null) {
       libraryElement.entryPoint = entryPoint;
@@ -7374,6 +7380,17 @@ class LibraryElementBuilder {
       }
     }
   }
+
+  /**
+   * If the given [node] has a documentation comment, remember its range
+   * into the given [element].
+   */
+  void _setDocRange(ElementImpl element, AnnotatedNode node) {
+    Comment comment = node.documentationComment;
+    if (comment != null && comment.isDocumentation) {
+      element.setDocRange(comment.offset, comment.length);
+    }
+  }
 }
 
 /**