#mixed_content  // f.c.MixedContent
    ${...}  // f.c.DollarVariable
        - content: ?trim  // f.c.BuiltInsForStringsBasic$trimBI
            - left-hand operand: x  // f.c.Identifier
            - right-hand operand: "trim"  // String
    #text  // f.c.TextBlock
        - content: "\n"  // String
    ${...}  // f.c.DollarVariable
        - content: ...(...)  // f.c.MethodCall
            - callee: ?left_pad  // f.c.BuiltInsForStringsBasic$padBI
                - left-hand operand: x  // f.c.Identifier
                - right-hand operand: "left_pad"  // String
            - argument value: 5  // f.c.NumberLiteral
    #text  // f.c.TextBlock
        - content: "\n"  // String
    ${...}  // f.c.DollarVariable
        - content: ...(...)  // f.c.MethodCall
            - callee: ?left_pad  // f.c.BuiltInsForStringsBasic$padBI
                - left-hand operand: x  // f.c.Identifier
                - right-hand operand: "left_pad"  // String
            - argument value: 5  // f.c.NumberLiteral
            - argument value: "-"  // f.c.StringLiteral
                - embedded template: null  // Null
    #text  // f.c.TextBlock
        - content: "\n"  // String
    ${...}  // f.c.DollarVariable
        - content: ?then(...)  // f.c.BuiltInsWithParseTimeParameters$then_BI
            - left-hand operand: x  // f.c.Identifier
            - right-hand operand: "then"  // String
            - argument value: "y"  // f.c.StringLiteral
                - embedded template: null  // Null
            - argument value: "n"  // f.c.StringLiteral
                - embedded template: null  // Null
    #text  // f.c.TextBlock
        - content: "\n"  // String
    ${...}  // f.c.DollarVariable
        - content: ?switch(...)  // f.c.BuiltInsWithParseTimeParameters$switch_BI
            - left-hand operand: x  // f.c.Identifier
            - right-hand operand: "switch"  // String
            - argument value: 1  // f.c.NumberLiteral
            - argument value: 11  // f.c.NumberLiteral
            - argument value: 2  // f.c.NumberLiteral
            - argument value: 22  // f.c.NumberLiteral
            - argument value: 33  // f.c.NumberLiteral
