dmac

#lang racket

(define-syntax-rule (foo form ...)
  ((lambda (bar) form ...) "ARG"))

(foo "Hello") ; => returns "Hello"

(foo bar)     ; => expand: unbound identifier in module in: bar

dmac

# I want to run bartask only if a line output from footask starts with a period.
# I'm not sure what is valid to use for "???" below.
# Things that don't work are: is, =, ==, equals, sameas, find.

- name: footask
  command: ...
  register: manifest

- name: bartask
  debug: msg="bartask ran"

dmac

$ ansible-playbook playbook.yml
PLAY [playbook] *************************************************************

GATHERING FACTS ***************************************************************
ok: [hosts]

TASK: [register a var] ********************************************************
skipping: [hosts]

TASK: [print a var] ***********************************************************

dmac

---
- hosts: localhost
  vars:
    - foo:
        a: 1
        b: 2
        c: 3
  tasks:
    - debug: msg="{{ item }} is {{ foo[item] }}"
      with_items: foo|list

dmac

127.0.0.1 localhost

dmac

fn main() {
    println!("{:?}", format!("{}", 1).as_bytes());
}

/*
main.rs:2:22: 2:39 error: borrowed value does not live long enough
main.rs:2     println!("{:?}", format!("{}", 1).as_bytes());
                               ^~~~~~~~~~~~~~~~~
main.rs:2:14: 2:20 note: reference must be valid for the block at 2:13...
main.rs:2     println!("{:?}", format!("{}", 1).as_bytes());

dmac

use std::hashmap::HashMap;

fn main() {
    let v = [("a", 1), ("b", 2), ("c", 3)];
    let m: HashMap<~str, int> = v.iter().map(|&(s, n)| (s.to_owned(), n)).collect();
    let keys = [~"a", ~"b", ~"c"];
    for k in keys.iter() {
        println!("{:?}: {:?}", k, m.get(k));
    }
}

dmac

- name: test playbook
  hosts: localhost
  tasks:
    - name: test lineinfile 
      local_action: lineinfile dest="{{ playbook_dir }}"/test.txt state=present line=foo create=yes

# failed: [127.0.0.1 -> 127.0.0.1] => {"failed": true}
# msg: missing required arguments: regexp

dmac

[group1]
localhost

[group1:vars]
n = 1

[group2]
localhost

[group2:vars]

dmac

int main(void) {
    int x = 1;
    x = x + 0.1;
}