assert_exit_status.bash

#!/bin/bash

assert_exit_status() {

  lambda() {
    local val_fd=$(echo $@ | tr -d ' ' | cut -d':' -f2)
    local arg=$1
    shift
    shift
    local cmd=$(echo $@ | xargs -E ':')
    local val=$(cat $val_fd)
    eval $arg=$val
    eval $cmd
  }

  local lambda=$1
  shift

  eval $@
  local ret=$?
  $lambda : <(echo $ret)

}

bash
. assert_exit_status.bash
assert_exit_status 'lambda status -> [[ $status -ne 0 ]] && echo Status is $status.' lls