parseUnit(void)
  skipErrorTokens(void)
  listener: beginCompilationUnit(void)
  syntheticPreviousToken(void)
  parseTopLevelDeclarationImpl(, DirectiveContext(DirectiveState.Unknown))
    parseMetadataStar()
      listener: beginMetadataStar(void)
      listener: endMetadataStar(0)
    parseTopLevelMemberImpl()
      listener: beginTopLevelMember(void)
      parseTopLevelMethod(, null, null, , VoidType(), null, f, false)
        listener: beginTopLevelMethod(, null, null)
        listener: handleVoidKeyword(void)
        ensureIdentifierPotentiallyRecovered(void, topLevelFunctionDeclaration, false)
          listener: handleIdentifier(f, topLevelFunctionDeclaration)
        parseMethodTypeVar(f)
          listener: handleNoTypeVariables(()
        parseGetterOrFormalParameters(f, f, false, MemberKind.TopLevelMethod)
          parseFormalParameters(f, MemberKind.TopLevelMethod)
            parseFormalParametersRest((, MemberKind.TopLevelMethod)
              listener: beginFormalParameters((, MemberKind.TopLevelMethod)
              parseFormalParameter((, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
                parseMetadataStar(()
                  listener: beginMetadataStar(x)
                  listener: endMetadataStar(0)
                listener: beginFormalParameter(x, MemberKind.TopLevelMethod, null, null, null)
                listener: handleNoType(()
                ensureIdentifier((, formalParameterDeclaration)
                  listener: handleIdentifier(x, formalParameterDeclaration)
                listener: handleFormalParameterWithoutValue())
                listener: endFormalParameter(null, null, null, x, null, null, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
              listener: endFormalParameters(1, (, ), MemberKind.TopLevelMethod)
        parseAsyncModifierOpt())
          listener: handleAsyncModifier(null, null)
          inPlainSync()
        parseFunctionBody(), false, false)
          listener: beginBlockFunctionBody({)
          notEofOrValue(}, dynamic)
          parseStatement({)
            parseStatementX({)
              parseExpressionStatementOrDeclaration({, null)
                parseExpressionStatementOrDeclarationAfterModifiers({, {, null, null, null, null)
                  looksLikeLocalFunction(when)
                  listener: beginMetadataStar(dynamic)
                  listener: endMetadataStar(0)
                  listener: handleIdentifier(dynamic, typeReference)
                  listener: handleNoTypeArguments(when)
                  listener: handleType(dynamic, null)
                  listener: beginVariablesDeclaration(when, null, null)
                  parseVariablesDeclarationRest(dynamic, true)
                    parseOptionallyInitializedIdentifier(dynamic)
                      ensureIdentifier(dynamic, localVariableDeclaration)
                        inPlainSync()
                        listener: handleIdentifier(when, localVariableDeclaration)
                      listener: beginInitializedIdentifier(when)
                      parseVariableInitializerOpt(when)
                        listener: handleNoVariableInitializer(when)
                      listener: endInitializedIdentifier(when)
                    ensureSemicolon(when)
                    listener: endVariablesDeclaration(1, ;)
          notEofOrValue(}, ()
          parseStatement(;)
            parseStatementX(;)
              parseExpressionStatementOrDeclaration(;, null)
                parseExpressionStatementOrDeclarationAfterModifiers(;, ;, null, null, null, null)
                  looksLikeLocalFunction(()
                  parseExpressionStatement(;)
                    parseExpression(;)
                      looksLikeOuterPatternEquals(;)
                        skipOuterPattern(;)
                      parsePatternAssignment(;)
                        parsePattern(;, PatternContext.assignment, precedence: 1)
                          listener: beginPattern(;)
                          parsePrimaryPattern(;, PatternContext.assignment)
                            parseParenthesizedPatternOrRecordPattern(;, PatternContext.assignment)
                              parsePattern((, PatternContext.assignment, precedence: 1)
                                listener: beginPattern(()
                                parsePrimaryPattern((, PatternContext.assignment)
                                  parseVariablePattern((, PatternContext.assignment, typeInfo: NoType())
                                    reportRecoverableError(when, Message[IllegalPatternAssignmentVariableName, A variable assigned by a pattern assignment can't be named 'when'., Choose a different name., {lexeme: when}])
                                      listener: handleRecoverableError(Message[IllegalPatternAssignmentVariableName, A variable assigned by a pattern assignment can't be named 'when'., Choose a different name., {lexeme: when}], when, when)
                                    listener: handleAssignedVariablePattern(when)
                                listener: endPattern(when)
                              ensureCloseParen(when, ()
                              listener: handleParenthesizedPattern(()
                          listener: endPattern())
                        parseExpression(=)
                          looksLikeOuterPatternEquals(=)
                            skipOuterPattern(=)
                              skipObjectPatternRest(x)
                          parsePrecedenceExpression(=, 1, true, ConstantPatternContext.none)
                            parseUnaryExpression(=, true, ConstantPatternContext.none)
                              parsePrimary(=, expression, ConstantPatternContext.none)
                                parseSendOrFunctionLiteral(=, expression, ConstantPatternContext.none)
                                  parseSend(=, expression, ConstantPatternContext.none)
                                    isNextIdentifier(=)
                                    ensureIdentifier(=, expression)
                                      listener: handleIdentifier(x, expression)
                                    listener: handleNoTypeArguments(;)
                                    parseArgumentsOpt(x)
                                      listener: handleNoArguments(;)
                                    listener: handleSend(x, x)
                        listener: handlePatternAssignment(=)
                    ensureSemicolon(x)
                    listener: handleExpressionStatement((, ;)
          notEofOrValue(}, })
          listener: endBlockFunctionBody(2, {, })
        listener: endTopLevelMethod(void, null, })
  listener: endTopLevelDeclaration(})
  reportAllErrorTokens(void)
  listener: endCompilationUnit(1, )