Support for GenericFunctionTypeElementImpl

[scheglov]

The crash log.

When dart-lang/sdk@a3f8740 is not rolled back.

@jcollins-g

stderr:  
 warning: unresolved doc reference [apply], from dart-js: (file:///b/build/slave/dart-sdk-linux-be/build/sdk/out/ReleaseIA32/dart-sdk/lib/js/dart2js/js_dart2js.dart:88:9)
Generation failed: Unknown type GenericFunctionTypeElementImpl
package:dartdoc/src/model.dart 1991:34                        new ModelElement.from
package:dartdoc/src/model.dart 3905:13                        new Parameter
package:dartdoc/src/model.dart 1988:31                        new ModelElement.from
package:dartdoc/src/model.dart 2516:25                        ModelElement.parameters.<fn>
dart:_internal                                                ListIterable.toList
package:dartdoc/src/model.dart 2517:10                        ModelElement.parameters
package:dartdoc/src/model.dart 2608:9                         ModelElement.linkedParams
package:dartdoc/src/model.dart 2411:40                        ModelElement.linkedParamsNoMetadata
dart:mirrors                                                  _LocalInstanceMirror.getField
package:mustache4dart/mustache_context.dart 335:19            _ObjectReflectorDeclaration.value
package:mustache4dart/mustache_context.dart 264:24            _ObjectReflector.[]
package:mustache4dart/mustache_context.dart 144:26            _MustacheContext._getActualValue
package:mustache4dart/mustache_context.dart 105:13            _MustacheContext._getMustachContext
package:mustache4dart/mustache_context.dart 101:12            _MustacheContext._getContextForKey
package:mustache4dart/mustache_context.dart 74:18             _MustacheContext._getInThisOrParent
package:mustache4dart/mustache_context.dart 70:12             _MustacheContext.[]
package:mustache4dart/src/tokens.dart 163:18                  _ExpressionToken.apply
package:mustache4dart/src/tokens.dart 40:18                   Token.call
package:mustache4dart/src/tmpl.dart 101:20                    _Template._write
package:mustache4dart/src/tmpl.dart 76:5                      _Template.call
package:mustache4dart/src/mustache.dart 11:64                 render
package:mustache4dart/src/tokens.dart 205:16                  _PartialToken.apply
package:mustache4dart/src/tokens.dart 280:57                  _StartSectionToken.apply.<fn>.<fn>
package:mustache4dart/src/tokens.dart 303:8                   _StartSectionToken.forEachUntilEndSection
package:mustache4dart/src/tokens.dart 280:9                   _StartSectionToken.apply.<fn>
dart:core                                                     Iterable.forEach
package:mustache4dart/src/tokens.dart 279:11                  _StartSectionToken.apply
package:mustache4dart/src/tokens.dart 293:53                  _StartSectionToken.apply.<fn>
package:mustache4dart/src/tokens.dart 303:8                   _StartSectionToken.forEachUntilEndSection
package:mustache4dart/src/tokens.dart 293:5                   _StartSectionToken.apply
package:mustache4dart/src/tokens.dart 40:18                   Token.call
package:mustache4dart/src/tmpl.dart 101:20                    _Template._write
package:mustache4dart/src/tmpl.dart 76:5                      _Template.call
package:dartdoc/src/html/html_generator_instance.dart 303:30  HtmlGeneratorInstance._build
package:dartdoc/src/html/html_generator_instance.dart 198:5   HtmlGeneratorInstance.generateLibrary
package:dartdoc/src/html/html_generator_instance.dart 99:7    HtmlGeneratorInstance._generateDocs
package:dartdoc/src/html/html_generator_instance.dart 47:7    HtmlGeneratorInstance.generate
package:dartdoc/src/html/html_generator.dart 74:22            HtmlGenerator.generate
package:dartdoc/dartdoc.dart 187:23                           DartDoc.generateDocs
third_party/pkg/dartdoc/bin/dartdoc.dart 200:44               main.<fn>
package:stack_trace                                           Chain.capture
third_party/pkg/dartdoc/bin/dartdoc.dart 199:9                main

[jcollins-g]

This actually is not the same as the other issue I was pursuing. Working on it now, though.

[jcollins-g]

Unfortunately, dart-lang/sdk@a3f8740 actually fixes some bugs in a way that makes it difficult to build a dartdoc that passes tests for both versions of the analyzer. Working on a solution for that, which may involve putting an unpublished dartdoc in the SDK for now until a new analyzer is released.