beginCompilationUnit(f)
  beginMetadataStar(f)
  endMetadataStar(0)
  beginTopLevelMember(f)
    beginTopLevelMethod(, null, null)
      handleNoType()
      handleIdentifier(f, topLevelFunctionDeclaration)
      handleNoTypeVariables(()
      beginFormalParameters((, MemberKind.TopLevelMethod)
        beginMetadataStar(x)
        endMetadataStar(0)
        beginFormalParameter(x, MemberKind.TopLevelMethod, null, null, null)
          handleNoType(()
          handleIdentifier(x, formalParameterDeclaration)
          handleFormalParameterWithoutValue(,)
        endFormalParameter(null, null, null, x, null, null, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
        beginMetadataStar(bool)
        endMetadataStar(0)
        beginFormalParameter(bool, MemberKind.TopLevelMethod, null, null, null)
          beginFunctionType(bool)
            handleNoTypeVariables(()
            handleIdentifier(bool, typeReference)
            handleNoTypeArguments(Function)
            handleType(bool, null)
            beginFormalParameters((, MemberKind.GeneralizedFunctionType)
            endFormalParameters(0, (, ), MemberKind.GeneralizedFunctionType)
          endFunctionType(Function, null)
          handleIdentifier(a, formalParameterDeclaration)
          handleFormalParameterWithoutValue())
        endFormalParameter(null, null, null, a, null, null, FormalParameterKind.requiredPositional, MemberKind.TopLevelMethod)
      endFormalParameters(2, (, ), MemberKind.TopLevelMethod)
      handleAsyncModifier(null, null)
      beginSwitchExpression(switch)
        handleIdentifier(x, expression)
        handleNoTypeArguments())
        handleNoArguments())
        handleSend(x, x)
        handleParenthesizedCondition((, null, null)
        beginSwitchExpressionBlock({)
          beginSwitchExpressionCase()
            beginPattern({)
              handleNoType(_)
              handleWildcardPattern(null, _)
            endPattern(_)
            handleSwitchExpressionCasePattern(_)
            handleIdentifier(a, expression)
            handleNoTypeArguments(()
            beginArguments(()
            endArguments(0, (, ))
            handleSend(a, ))
            handleLiteralInt(0)
          endSwitchExpressionCase(_, when, =>, 0)
        endSwitchExpressionBlock(1, {, })
      endSwitchExpression(switch, })
      handleExpressionFunctionBody(=>, ;)
    endTopLevelMethod(f, null, ;)
  endTopLevelDeclaration(;)
endCompilationUnit(1, )