task/testdata/vars/Taskfile.yml

default:
  deps: [hello]

hello:
  deps: [set-equal]
  cmds:
    - echo {{.FOO}} > foo.txt
    - echo {{.BAR}} > bar.txt
    - echo {{.FOO2}} > foo2.txt
    - echo {{.BAR2}} > bar2.txt
    - echo {{.EQUAL}} > equal.txt
  vars:
    FOO: foo
    BAR: $echo bar

set-equal:
  set: EQUAL
  cmds:
    - echo foo=bar