VRL compiler warns about the unused result of `set_semantic_meaning`

[sfackler]

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Problem

The VRL compiler reports a warning for calls to set_semantic_meaning:

2024-11-26T02:02:17.453462Z  WARN transform{component_kind="transform" component_id=talos_kernel_logs_cleanup component_type=remap}: vector::transforms::remap: VRL compilation warning. warnings=
warning[E900]: unused result for function call `set_semantic_meaning(."talos-time", "timestamp")`
  ┌─ :1:1
  │
1 │ set_semantic_meaning(."talos-time", "timestamp")
  │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the result of this expression or remove it
  │
  = this expression has no side-effects
  = see language documentation at https://vrl.dev
  = try your code in the VRL REPL, learn more at https://vrl.dev/examples

From looking at the docs, it seems to be true that the function has no side effects, but that it also returns no value so the warning seems wrong.

Configuration

set_semantic_meaning(."talos-time", "timestamp")

del(.clock)
del(.seq)
del(."talos-level")
."talos-time" = parse_timestamp!(."talos-time", "%+")

Version

0.42.0

Debug Output

No response

Example Data

No response

Additional Context

No response

References

No response

[pront]

Thanks @sfackler,

Edit:

• we need to mark this as impure() here
• add set_semantic_meaning to this list

[pront]

Fixing this in VRL now.