# ok! Assert that an expression is `%Ok` and unwrap its `:value`; if it is `%Err`, return from the enclosing function with that Err. Any other value passes through unchanged. ## Syntax 
[ok! $expr]
[$expr](ok!)
`ok!` is compiler-intercepted — both forms emit inline opcodes rather than a function call — so it must appear inside a function body where the short-circuit return is meaningful. The stub entry only exists for `info` and completion. ## Examples 
def inc-or-fail {|x|
    if ($x > 100) { [err "too big"] } else { [ok ($x + 1)] }
}

def go {|x|
    set v [ok! [inc-or-fail $x]]   # on %Err, go returns immediately
    ($v * 10)
}

[go 4]        # → 50
[go 200]      # → %Err{:message "too big"}
## Returns The `:value` inside an `%Ok`; on `%Err`, the enclosing function returns the Err immediately. Non-Result values pass through unchanged. ## See Also `err!`, `ok`, `err`, `unwrap`, `and-then`
← num
ok →