1. nostop

Syntax

        {do|run} filename [arguments] [, nostop ]

nostop allows the do-file to continue executing even if an error occurs.
        Normally, Stata stops executing the do-file when it detects an error
        (nonzero return code).

2. capture

**************
clear*
inp x
1
2
2
2
end
gen error=0
forv i=1/4{
capt assert x==1 in `i'
di in red _rc
replace error=_rc in `i'
}
l
**************