Snippet from https://play.nim-lang.org

playground.nim

import options
import typetraits

template hasValue[T](o: Option[T]): bool =
  proc default(): T = discard
  
  let isSome = o.isSome()
  (let `o` {.inject.} = (if isSome: o.get() else: default()); isSome)

let x = some(123)
echo(type(x).name) # Option[system.int]
echo(x) # some(123)

if x.hasValue():
  echo(type(x).name) # int
  echo(x) # 123