|  | 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) | 
|  | endFormalParameters(1, (, ), 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(_) | 
|  | handleLiteralInt(0) | 
|  | endSwitchExpressionCase(_, null, =>, 0) | 
|  | endSwitchExpressionBlock(1, {, }) | 
|  | endSwitchExpression(switch, }) | 
|  | handleExpressionFunctionBody(=>, ;) | 
|  | endTopLevelMethod(f, null, ;) | 
|  | endTopLevelDeclaration(;) | 
|  | endCompilationUnit(1, ) |