parseUnit(void)
  skipErrorTokens(void)
  listener: beginCompilationUnit(void)
  syntheticPreviousToken(void)
  parseTopLevelDeclarationImpl(, Instance of 'DirectiveContext')
    parseMetadataStar()
      listener: beginMetadataStar(void)
      listener: endMetadataStar(0)
    parseTopLevelMemberImpl()
      listener: beginTopLevelMember(void)
      parseTopLevelMethod(, null, null, , Instance of 'VoidType', null, main, false)
        listener: beginTopLevelMethod(, null, null)
        listener: handleVoidKeyword(void)
        ensureIdentifierPotentiallyRecovered(void, topLevelFunctionDeclaration, false)
          listener: handleIdentifier(main, topLevelFunctionDeclaration)
        parseMethodTypeVar(main)
          listener: handleNoTypeVariables(()
        parseGetterOrFormalParameters(main, main, false, MemberKind.TopLevelMethod)
          parseFormalParameters(main, MemberKind.TopLevelMethod)
            parseFormalParametersRest((, MemberKind.TopLevelMethod)
              listener: beginFormalParameters((, MemberKind.TopLevelMethod)
              parseFormalParameter((, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
                parseMetadataStar(()
                  listener: beginMetadataStar(int)
                  listener: endMetadataStar(0)
                listener: beginFormalParameter(int, MemberKind.TopLevelMethod, null, null, null)
                listener: handleIdentifier(int, typeReference)
                listener: handleNoTypeArguments(onX)
                listener: handleType(int, null)
                ensureIdentifier(int, formalParameterDeclaration)
                  listener: handleIdentifier(onX, formalParameterDeclaration)
                listener: handleFormalParameterWithoutValue())
                listener: endFormalParameter(null, null, null, onX, null, null, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
              listener: endFormalParameters(1, (, ), MemberKind.TopLevelMethod)
        parseAsyncModifierOpt())
          listener: handleAsyncModifier(null, null)
          inPlainSync()
        parseFunctionBody(), false, false)
          listener: beginBlockFunctionBody({)
          notEofOrValue(}, try)
          parseStatement({)
            parseStatementX({)
              parseTryStatement({)
                listener: beginTryStatement(try)
                parseBlock(try, BlockKind(try statement))
                  ensureBlock(try, null, try statement)
                  listener: beginBlock({, BlockKind(try statement))
                  notEofOrValue(}, ;)
                  parseStatement({)
                    parseStatementX({)
                      parseEmptyStatement({)
                        listener: handleEmptyStatement(;)
                  notEofOrValue(}, })
                  listener: endBlock(1, {, }, BlockKind(try statement))
                listener: beginCatchClause(catch)
                parseFormalParameters(catch, MemberKind.Catch)
                  parseFormalParametersRest((, MemberKind.Catch)
                    listener: beginFormalParameters((, MemberKind.Catch)
                    parseFormalParameter((, FormalParameterKind.requiredPositional, MemberKind.Catch)
                      parseMetadataStar(()
                        listener: beginMetadataStar(e)
                        listener: endMetadataStar(0)
                      listener: beginFormalParameter(e, MemberKind.Catch, null, null, null)
                      listener: handleNoType(()
                      ensureIdentifier((, formalParameterDeclaration)
                        listener: handleIdentifier(e, formalParameterDeclaration)
                      listener: handleFormalParameterWithoutValue())
                      listener: endFormalParameter(null, null, null, e, null, null, FormalParameterKind.requiredPositional, MemberKind.Catch)
                    listener: endFormalParameters(1, (, ), MemberKind.Catch)
                listener: endCatchClause({)
                parseBlock(), BlockKind(catch clause))
                  ensureBlock(), null, catch clause)
                  listener: beginBlock({, BlockKind(catch clause))
                  notEofOrValue(}, ;)
                  parseStatement({)
                    parseStatementX({)
                      parseEmptyStatement({)
                        listener: handleEmptyStatement(;)
                  notEofOrValue(}, })
                  listener: endBlock(1, {, }, BlockKind(catch clause))
                listener: handleCatchBlock(null, catch, null)
                listener: beginCatchClause(on)
                listener: handleIdentifier(Foo, typeReference)
                listener: handleNoTypeArguments({)
                listener: handleType(Foo, null)
                listener: endCatchClause({)
                parseBlock(Foo, BlockKind(catch clause))
                  ensureBlock(Foo, null, catch clause)
                  listener: beginBlock({, BlockKind(catch clause))
                  notEofOrValue(}, ;)
                  parseStatement({)
                    parseStatementX({)
                      parseEmptyStatement({)
                        listener: handleEmptyStatement(;)
                  notEofOrValue(}, })
                  listener: endBlock(1, {, }, BlockKind(catch clause))
                listener: handleCatchBlock(on, null, null)
                listener: endTryStatement(2, try, null)
          notEofOrValue(}, onX)
          parseStatement(})
            parseStatementX(})
              parseExpressionStatementOrDeclarationAfterModifiers(}, }, null, null, null, false)
                looksLikeLocalFunction(onX)
                parseExpressionStatement(})
                  parseExpression(})
                    parsePrecedenceExpression(}, 1, true)
                      parseUnaryExpression(}, true)
                        parsePrimary(}, expression)
                          parseSendOrFunctionLiteral(}, expression)
                            parseSend(}, expression)
                              isNextIdentifier(})
                              ensureIdentifier(}, expression)
                                listener: handleIdentifier(onX, expression)
                              listener: handleNoTypeArguments(=)
                              parseArgumentsOpt(onX)
                                listener: handleNoArguments(=)
                              listener: handleSend(onX, =)
                      parsePrecedenceExpression(=, 1, true)
                        parseUnaryExpression(=, true)
                          parsePrimary(=, expression)
                            parseLiteralInt(=)
                              listener: handleLiteralInt(42)
                      listener: handleAssignmentExpression(=)
                  ensureSemicolon(42)
                  listener: handleExpressionStatement(;)
          notEofOrValue(}, })
          listener: endBlockFunctionBody(2, {, })
        listener: endTopLevelMethod(void, null, })
  listener: endTopLevelDeclaration()
  reportAllErrorTokens(void)
  listener: endCompilationUnit(1, )