DSL EXPRESSION:
NR == 3 {@v[1]  = $*}


AST:
"block" [tt:block] [nt:StatementBlock]
    "==" [tt:op_eqeq] [nt:CondBlock]
        "==" [tt:op_eqeq] [nt:Operator]
            "NR" [tt:ctx_NR] [nt:ctx_NR]
            "3" [tt:int_literal] [nt:int_literal]
        "block" [tt:block] [nt:StatementBlockInBraces]
            "block" [tt:block] [nt:StatementBlock]
                "=" [tt:equals] [nt:Assignment]
                    "[]" [tt:[]] [nt:ArrayOrMapIndexAccess]
                        "@v" [tt:oosvar_name] [nt:DirectOosvarValue]
                        "1" [tt:int_literal] [nt:int_literal]
                    "$*" [tt:full_srec] [nt:FullSrec]

