rept 1 { some code
some code

rept 0 { some code }; this problems !
some code; this is absent in code ! Because second rept 0 !
some code; this is absent in code ! Because second rept 0 !
}
    

rept 1 { some code
rept 0 { some code \} ; <--- escape this
}    

rept 1 { some code1
rept 0 { some code2 \} 
some code3
rept 0 { some code4 \} 
some code5
rept 1 { some code6 
 some code7
rept 0 { some code8 \\}
 some code9
\} 
}