DSL EXPRESSION:
for(k,v in $*) {unset $[k]}; $j = NR


AST:
"block" [tt:block] [nt:StatementBlock]
    "for" [tt:kw_for] [nt:ForLoopTwoVariable]
        "k" [tt:non_sigil_name] [nt:LocalVariable]
        "v" [tt:non_sigil_name] [nt:LocalVariable]
        "$*" [tt:full_srec] [nt:FullSrec]
        "block" [tt:block] [nt:StatementBlockInBraces]
            "block" [tt:block] [nt:StatementBlock]
                "unset" [tt:kw_unset] [nt:Unset]
                    "$[]" [tt:$[]] [nt:IndirectFieldValue]
                        "k" [tt:non_sigil_name] [nt:LocalVariable]
    "=" [tt:equals] [nt:Assignment]
        "$j" [tt:field_name] [nt:DirectFieldValue]
        "NR" [tt:ctx_NR] [nt:ctx_NR]

j=1
j=2
j=3
j=4
j=5
j=6
j=7
j=8
j=9
j=10
