Official example of variables gives syntax error: `template: :1: unexpected ".0" in operand`

[your-diary]

Description

How to reproduce:

1. Visit the documentation of variables.

2. Copy and paste the example in it:

   version: 3
   
   tasks:
     foo:
       vars:
         STRING: 'Hello, World!'
         BOOL: true
         INT: 42
         FLOAT: 3.14
         ARRAY: [1, 2, 3]
         MAP:
           map: {A: 1, B: 2, C: 3}
       cmds:
         - 'echo {{.STRING}}'  # Hello, World!
         - 'echo {{.BOOL}}'    # true
         - 'echo {{.INT}}'     # 42
         - 'echo {{.FLOAT}}'   # 3.14
         - 'echo {{.ARRAY}}'   # [1 2 3]
         - 'echo {{.ARRAY.0}}' # 1
         - 'echo {{.MAP}}'     # map[A:1 B:2 C:3]
         - 'echo {{.MAP.A}}'   # 1

3. Execute task foo command.

4. It gives syntax error:

   template: :1: unexpected ".0" in operand
   

---

The cause is this line:

- 'echo {{.ARRAY.0}}' # 1

Maybe we should use index function instead (i.e. index .ARRAY 0)?
Or is there any more concise syntax supported?

Version

3.43.2

Operating system

macOS

Experiments Enabled

No response

Example Taskfile

version: 3

tasks:
  foo:
    vars:
      STRING: 'Hello, World!'
      BOOL: true
      INT: 42
      FLOAT: 3.14
      ARRAY: [1, 2, 3]
      MAP:
        map: {A: 1, B: 2, C: 3}
    cmds:
      - 'echo {{.STRING}}'  # Hello, World!
      - 'echo {{.BOOL}}'    # true
      - 'echo {{.INT}}'     # 42
      - 'echo {{.FLOAT}}'   # 3.14
      - 'echo {{.ARRAY}}'   # [1 2 3]
      - 'echo {{.ARRAY.0}}' # 1
      - 'echo {{.MAP}}'     # map[A:1 B:2 C:3]
      - 'echo {{.MAP.A}}'   # 1

Could be related to #2195

[pd93]

Thanks for the report. As suggested, this was just a docs error. It should be {{index .ARRAY 0}}. This has been updated in 20c1ffe and is now released.