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, 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(}, if)
          parseStatement({)
            parseStatementX({)
              parseIfStatement({)
                listener: beginIfStatement(if)
                ensureParenthesizedCondition(if, allowCase: true)
                  parseExpressionInParenthesisRest((, allowCase: true)
                    parseExpression(()
                      looksLikeOuterPatternEquals(()
                        skipOuterPattern(()
                          skipObjectPatternRest(x)
                      parsePrecedenceExpression((, 1, true)
                        parseUnaryExpression((, true)
                          parsePrimary((, expression)
                            parseSendOrFunctionLiteral((, expression)
                              parseSend((, expression)
                                isNextIdentifier(()
                                ensureIdentifier((, expression)
                                  listener: handleIdentifier(x, expression)
                                listener: handleNoTypeArguments(case)
                                parseArgumentsOpt(x)
                                  listener: handleNoArguments(case)
                                listener: handleSend(x, case)
                    parsePattern(case, PatternContext.matching, precedence: 1)
                      parsePrimaryPattern(case, PatternContext.matching)
                        listener: beginConstantPattern(null)
                        parsePrecedenceExpression(case, 17, false)
                          parseUnaryExpression(case, false)
                            parsePrimary(case, expression)
                              parseLiteralInt(case)
                                listener: handleLiteralInt(0)
                        listener: endConstantPattern(null)
                      listener: beginAsOperatorType(as)
                      computeTypeAfterIsOrAs(as)
                      listener: handleIdentifier(int, typeReference)
                      listener: handleNoTypeArguments(when)
                      listener: handleType(int, null)
                      listener: endAsOperatorType(as)
                      listener: handleCastPattern(as)
                    listener: beginPatternGuard(when)
                    parseExpression(when)
                      looksLikeOuterPatternEquals(when)
                        skipOuterPattern(when)
                      parsePrecedenceExpression(when, 1, true)
                        parseUnaryExpression(when, true)
                          parsePrimary(when, expression)
                            parseLiteralBool(when)
                              listener: handleLiteralBool(true)
                    listener: endPatternGuard(when)
                    ensureCloseParen(true, ()
                    listener: handleParenthesizedCondition((, case, when)
                listener: beginThenStatement({)
                parseStatement())
                  parseStatementX())
                    parseBlock(), BlockKind(statement))
                      ensureBlock(), null, null)
                      listener: beginBlock({, BlockKind(statement))
                      notEofOrValue(}, })
                      listener: endBlock(0, {, }, BlockKind(statement))
                listener: endThenStatement(})
                listener: endIfStatement(if, null)
          notEofOrValue(}, })
          listener: endBlockFunctionBody(1, {, })
        listener: endTopLevelMethod(void, null, })
  listener: endTopLevelDeclaration()
  reportAllErrorTokens(void)
  listener: endCompilationUnit(1, )