Stack overflow on `[this()]` reference

[lrhn]

I was trying to deduce the valid DartDoc source references, and tried [this()] as a synnonym of [CurrentClass()] as a reference to the unnamed constructor.
That crashed DartDoc with a stack overflow, with a stack trace ending in:

dartdoc 8.0.9 (/somewhere/sdk/doc-test/dartdev) failed: Stack Overflow         
#0      ElementImpl.hashCode (package:analyzer/src/dart/element/element.dart:2063:3)   
#1      Object.hash (dart:core/object.dart:207:19)                                     
#2      ConstructedModelElementsKey.hashCode (package:dartdoc/src/model/package_graph.dart:1032:36)                                                                           
#3      ConstructedModelElementsKey.hashCode (package:dartdoc/src/model/package_graph.dart)                                                                                   
#4      new ModelElement.for_ (package:dartdoc/src/model/model_element.dart:224:70)    
#5      new ModelElement.forElement (package:dartdoc/src/model/model_element.dart:106:25)                                                                                     
#6      ModelElement.definingLibrary (package:dartdoc/src/model/model_element.dart:451:7)                                                                                     
#7      Container.referenceParents (package:dartdoc/src/model/container.dart:250:55)   
#8      CommentReferable.referenceBy (package:dartdoc/src/model/comment_referable.dart:53:25)                                                                                 
#9      CommentReferable._recurseChildrenAndFilter (package:dartdoc/src/model/comment_referable.dart:139:28)                                                                  
#10     CommentReferable.referenceBy (package:dartdoc/src/model/comment_referable.dart:67:22)                                                                                 
#11     CommentReferable._recurseChildrenAndFilter (package:dartdoc/src/model/comment_referable.dart:139:28)                                                                  
#12     CommentReferable.referenceBy (package:dartdoc/src/model/comment_referable.dart:67:22)
#13     CommentReferable._recurseChildrenAndFilter (package:dartdoc/src/model/comment_referable.dart:139:28) 
#14     CommentReferable.referenceBy (package:dartdoc/src/model/comment_referable.dart:67:22)

I see you are removing [this] as a way to say this [CurrentClass]. Maybe [this()] just shouldn't work either - it's not really readable.
(Although I can see why [this] can be useful, it's better to not use an unqualified "this" in DartDoc anyway.)

[srawlins]

Great catch! Fixed with #3765