title: Simplification of validators.

-- in.cue --
package main

import (
    "strings"
    "time"
)

t1: {
    #Test: {
        #HTTP:  =~"^http://"
        #SSH:   !~"^ssh://"
        #USER:  strings.MinRunes(3)
        source: #HTTP | #SSH | #USER | #Test
    }

    foo: #Test & {
        source: "http://blablabla"
    }

    bar: #Test & {
        source: foo
    }
}

t2: {
    str: "foo"
    a: =~str
    b: =~"foo"
    c: a & b & a & b

    d: time.Time
    e: time.Time()
    f: d & e & d & e
}


-- out/eval --
(struct){
  t1: (struct){
    #Test: (#struct){
      #HTTP: (string){ =~"^http://" }
      #SSH: (string){ !~"^ssh://" }
      #USER: (string){ strings.MinRunes(3) }
      source: (string){ |((string){ =~"^http://" }, (string){ !~"^ssh://" }, (string){ strings.MinRunes(3) }) }
    }
    foo: (#struct){
      #HTTP: (string){ =~"^http://" }
      #SSH: (string){ !~"^ssh://" }
      #USER: (string){ strings.MinRunes(3) }
      source: (string){ "http://blablabla" }
    }
    bar: (#struct){
      #HTTP: (string){ =~"^http://" }
      #SSH: (string){ !~"^ssh://" }
      #USER: (string){ strings.MinRunes(3) }
      source: (#struct){
        #HTTP: (string){ =~"^http://" }
        #SSH: (string){ !~"^ssh://" }
        #USER: (string){ strings.MinRunes(3) }
        source: (string){ "http://blablabla" }
      }
    }
  }
  t2: (struct){
    str: (string){ "foo" }
    a: (string){ =~"foo" }
    b: (string){ =~"foo" }
    c: (string){ =~"foo" }
    d: (string){ time.Time }
    e: (string){ time.Time() }
    f: (string){ time.Time }
  }
}
-- out/compile --
--- in.cue
{
  t1: {
    #Test: {
      #HTTP: =~"^http://"
      #SSH: !~"^ssh://"
      #USER: 〈import;strings〉.MinRunes(3)
      source: (〈0;#HTTP〉|〈0;#SSH〉|〈0;#USER〉|〈1;#Test〉)
    }
    foo: (〈0;#Test〉 & {
      source: "http://blablabla"
    })
    bar: (〈0;#Test〉 & {
      source: 〈1;foo〉
    })
  }
  t2: {
    str: "foo"
    a: =~〈0;str〉
    b: =~"foo"
    c: (((〈0;a〉 & 〈0;b〉) & 〈0;a〉) & 〈0;b〉)
    d: 〈import;time〉.Time
    e: 〈import;time〉.Time()
    f: (((〈0;d〉 & 〈0;e〉) & 〈0;d〉) & 〈0;e〉)
  }
}