KT element: KtStringTemplateExpression
FIR element: FirStringConcatenationCallImpl
FIR source kind: KtRealSourceElementKind

FIR element rendered:
<strcat>(String(string ), IntegerLiteral(1).plus#(IntegerLiteral(2)), String( template))

FIR FILE:
FILE: [ResolvedTo(IMPORTS)] wholeStringTemplateScript.kts
    context(<script>@kotlin.script.templates.standard.ScriptTemplateWithArgs)
    SCRIPT: [ResolvedTo(BODY_RESOLVE)] 
        [ResolvedTo(RAW_FIR)] lval args: R|kotlin/Array<kotlin/String>|

        public? final? [ResolvedTo(RAW_FIR)] val x: <implicit> = <strcat>(String(string ), IntegerLiteral(1).plus#(IntegerLiteral(2)), String( template))
            public? [ResolvedTo(RAW_FIR)] get(): <implicit>