Basic Vector REPL expressions output warning messages via: vrl::compiler::unused_expression_checker

[hillmandj]

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Problem

After updating to 0.39.0, I noticed an issue with the vector repl, please see the output below:

> VRL REPL commands:
>   help              Learn more about VRL
>   next              Load the next object or create a new one
>   prev              Load the previous object
>   exit              Terminate the program
>
> Any other value is resolved to a VRL expression.
>
> Try it out now by typing `.` and hitting [enter] to see the result.

$ o = { "a" : 1, "b" : 2 }
{ "a": 1, "b": 2 }

$ y = o.a2024-07-10T19:41:47.423618Z  WARN vrl::compiler::unused_expression_checker: unexpected identifier `o` reported as used

2024-07-10T19:41:47.423928Z  WARN vrl::compiler::unused_expression_checker: unexpected identifier `o` reported as used
1

It seems that the expression checker is making it difficult to use the REPL and outputting an error/warn message.

Configuration

No response

Version

0.39.0

Debug Output

No response

Example Data

No response

Additional Context

No response

References

No response