NPE in ErrorVerifier

[bwilkerson]

Dart analysis server, SDK version 1.20.0-dev.5.0, server version 1.17.0, error: Task failed: VerifyUnitTask for source x.dart
Unexpected exception while performing VerifyUnitTask for source x.dart
#0 AnalysisTask._safelyPerform (package:analyzer/task/model.dart:351)
#1 AnalysisTask.perform (package:analyzer/task/model.dart:238)
#2 AnalysisDriver.performWorkItem (package:analyzer/src/task/driver.dart:284)
#3 AnalysisDriver.performAnalysisTask (package:analyzer/src/task/driver.dart:255)
#4 AnalysisContextImpl.performAnalysisTask. (package:analyzer/src/context/context.dart:1243)
#5 _PerformanceTagImpl.makeCurrentWhile (package:analyzer/src/generated/utilities_general.dart:212)
#6 AnalysisContextImpl.performAnalysisTask (package:analyzer/src/context/context.dart:1241)
#7 PerformAnalysisOperation.perform (package:analysis_server/src/operation/operation_analysis.dart:355)
#8 AnalysisServer.performOperation (package:analysis_server/src/analysis_server.dart:893)
#9 Future.Future. (dart:async/future.dart:118)
#10 _rootRun (dart:async/zone.dart:1146)
#11 _CustomZone.run (dart:async/zone.dart:1026)
#12 _CustomZone.runGuarded (dart:async/zone.dart:924)
#13 _CustomZone.bindCallback. (dart:async/zone.dart:951)
#14 _rootRun (dart:async/zone.dart:1150)
#15 _CustomZone.run (dart:async/zone.dart:1026)
#16 _CustomZone.runGuarded (dart:async/zone.dart:924)
#17 _CustomZone.bindCallback. (dart:async/zone.dart:951)
#18 Timer._createTimer. (dart:async-patch/timer_patch.dart:16)
#19 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:385)
#20 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:414)
#21 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:148)

Caused by The null object does not have a getter 'displayName'.

NoSuchMethodError: method not found: 'displayName'
Receiver: null
Arguments: []
#0 Object._noSuchMethod (dart:core-patch/object_patch.dart:44)
#1 Object.noSuchMethod (dart:core-patch/object_patch.dart:47)
#2 ErrorVerifier._checkForAmbiguousImport (package:analyzer/src/generated/error_verifier.dart:2362)
#3 ErrorVerifier.visitSimpleIdentifier (package:analyzer/src/generated/error_verifier.dart:1130)
#4 SimpleIdentifierImpl.accept (package:analyzer/src/dart/ast/ast.dart:9010)
#5 TypeNameImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:10333)
#6 RecursiveAstVisitor.visitTypeName (package:analyzer/dart/ast/visitor.dart:1936)
#7 ErrorVerifier.visitTypeName (package:analyzer/src/generated/error_verifier.dart:1200)
#8 TypeNameImpl.accept (package:analyzer/src/dart/ast/ast.dart:10329)
#9 ConstructorNameImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:3091)
#10 RecursiveAstVisitor.visitConstructorName (package:analyzer/dart/ast/visitor.dart:1479)
#11 ConstructorNameImpl.accept (package:analyzer/src/dart/ast/ast.dart:3087)
#12 InstanceCreationExpressionImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:6154)
#13 RecursiveAstVisitor.visitInstanceCreationExpression (package:analyzer/dart/ast/visitor.dart:1665)
#14 ErrorVerifier.visitInstanceCreationExpression (package:analyzer/src/generated/error_verifier.dart:916)
#15 InstanceCreationExpressionImpl.accept (package:analyzer/src/dart/ast/ast.dart:6150)
#16 MethodInvocationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:7313)
#17 RecursiveAstVisitor.visitMethodInvocation (package:analyzer/dart/ast/visitor.dart:1743)
#18 ErrorVerifier.visitMethodInvocation (package:analyzer/src/generated/error_verifier.dart:1021)
#19 MethodInvocationImpl.accept (package:analyzer/src/dart/ast/ast.dart:7309)
#20 ExpressionStatementImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:4156)
#21 RecursiveAstVisitor.visitExpressionStatement (package:analyzer/dart/ast/visitor.dart:1557)
#22 ExpressionStatementImpl.accept (package:analyzer/src/dart/ast/ast.dart:4152)
#23 NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:7688)
#24 BlockImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:1284)
#25 RecursiveAstVisitor.visitBlock (package:analyzer/dart/ast/visitor.dart:1389)
#26 ErrorVerifier.visitBlock (package:analyzer/src/generated/error_verifier.dart:400)
#27 BlockImpl.accept (package:analyzer/src/dart/ast/ast.dart:1280)
#28 IfStatementImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:5704)
#29 RecursiveAstVisitor.visitIfStatement (package:analyzer/dart/ast/visitor.dart:1641)
#30 ErrorVerifier.visitIfStatement (package:analyzer/src/generated/error_verifier.dart:867)
#31 IfStatementImpl.accept (package:analyzer/src/dart/ast/ast.dart:5699)
#32 NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:7688)
#33 BlockImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:1284)
#34 RecursiveAstVisitor.visitBlock (package:analyzer/dart/ast/visitor.dart:1389)
#35 ErrorVerifier.visitBlock (package:analyzer/src/generated/error_verifier.dart:400)
#36 BlockImpl.accept (package:analyzer/src/dart/ast/ast.dart:1280)
#37 BlockFunctionBodyImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:1228)
#38 RecursiveAstVisitor.visitBlockFunctionBody (package:analyzer/dart/ast/visitor.dart:1395)
#39 ErrorVerifier.visitBlockFunctionBody (package:analyzer/src/generated/error_verifier.dart:419)
#40 BlockFunctionBodyImpl.accept (package:analyzer/src/dart/ast/ast.dart:1224)
#41 MethodDeclarationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:7196)
#42 RecursiveAstVisitor.visitMethodDeclaration (package:analyzer/dart/ast/visitor.dart:1737)
#43 ErrorVerifier.visitMethodDeclaration (package:analyzer/src/generated/error_verifier.dart:1000)
#44 MethodDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:7187)
#45 NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:7688)
#46 ClassDeclarationImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:1915)
#47 RecursiveAstVisitor.visitClassDeclaration (package:analyzer/dart/ast/visitor.dart:1425)
#48 ErrorVerifier.visitClassDeclaration (package:analyzer/src/generated/error_verifier.dart:498)
#49 ClassDeclarationImpl.accept (package:analyzer/src/dart/ast/ast.dart:1847)
#50 NodeListImpl.accept (package:analyzer/src/dart/ast/ast.dart:7688)
#51 CompilationUnitImpl.visitChildren (package:analyzer/src/dart/ast/ast.dart:2446)
#52 RecursiveAstVisitor.visitCompilationUnit (package:analyzer/dart/ast/visitor.dart:1449)
#53 ErrorVerifier.visitCompilationUnit (package:analyzer/src/generated/error_verifier.dart:568)
#54 CompilationUnitImpl.accept (package:analyzer/src/dart/ast/ast.dart:2439)
#55 VerifyUnitTask.internalPerform (package:analyzer/src/task/dart.dart:6142)
#56 AnalysisTask._safelyPerform (package:analyzer/task/model.dart:339)
#57 AnalysisTask.perform (package:analyzer/task/model.dart:238)
#58 AnalysisDriver.performWorkItem (package:analyzer/src/task/driver.dart:284)
#59 AnalysisDriver.performAnalysisTask (package:analyzer/src/task/driver.dart:255)
#60 AnalysisContextImpl.performAnalysisTask. (package:analyzer/src/context/context.dart:1243)
#61 _PerformanceTagImpl.makeCurrentWhile (package:analyzer/src/generated/utilities_general.dart:212)
#62 AnalysisContextImpl.performAnalysisTask (package:analyzer/src/context/context.dart:1241)
#63 PerformAnalysisOperation.perform (package:analysis_server/src/operation/operation_analysis.dart:355)
#64 AnalysisServer.performOperation (package:analysis_server/src/analysis_server.dart:893)
#65 Future.Future. (dart:async/future.dart:118)
#66 _rootRun (dart:async/zone.dart:1146)
#67 _CustomZone.run (dart:async/zone.dart:1026)
#68 _CustomZone.runGuarded (dart:async/zone.dart:924)
#69 _CustomZone.bindCallback. (dart:async/zone.dart:951)
#70 _rootRun (dart:async/zone.dart:1150)
#71 _CustomZone.run (dart:async/zone.dart:1026)
#72 _CustomZone.runGuarded (dart:async/zone.dart:924)
#73 _CustomZone.bindCallback. (dart:async/zone.dart:951)
#74 Timer._createTimer. (dart:async-patch/timer_patch.dart:16)
#75 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:385)
#76 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:414)
#77 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:148)

[bwilkerson]

https://codereview.chromium.org/2403503002/