error on lakefile.toml

Stream: general

[Ahmed]

I get this error

error: lakefile.toml:1:0: missing required key: name

How to solve it? please help!

[Kevin Buzzard]

Can you post your lakefile.toml?

[Ahmed]

yeah sure here:

[package]
name = "VCRRMaths"
version = "0.1.0"
lean_version = "leanprover/lean4:stable"

[workspace]

[dependencies]
Mathlib = { git = "https://github.com/leanprover-community/mathlib4.git", rev = "main" }

[Ahmed]

is there a problem with this?

[Ahmed]

I've been trying to solve it for a couple of mins now and still I can't!

[Ruben Van de Velde]

Where did you get it?

[Ruben Van de Velde]

Because that doesn't look remotely like any I've seen

[Ahmed]

I got it from ChatGPT

[Ahmed]

idk if it is right

[Ruben Van de Velde]

Okay, then step away from chatgpt and read the documentation instead

[Ahmed]

okay sure

[Aaron Liu]

What happened to the default lakefile?

[Kevin Buzzard]

If the user is using an LLM then all bets are off.

[Chris Henson]

That syntax makes me think the LLM saw the .toml extension and jumped to using the Rust syntax.

[Chris Henson]

As Aaron suggests, I would start with the lakefile lake new gives you and work from there.

[Kim Morrison]

@Ahmed, just some general advice, also relevant for everyone. :-)

If you're posting content generated by an AI, or asking about error messages coming from content generated by an AI, it is essential that you say so when posting or asking.

In terms of using AIs, you should be very skeptical of anything written by an AI in the web interfaces (e.g. chat.openai.com or whatever). These AIs are working in a void, with neither access to current information (unless you see evidence they are doing web searches), and without the ability to verify their work.

If you were using Claude Code, on the other hand, and asked it "Please find and read the current documentation on lakefile.toml, and then create one for me", I'm pretty sure it would give an excellent answer (in fact, it would very likely run lake build for you without even being asked, and iterate if something went wrong). (Of course, this is strictly a worse procedure than running lake new --- a human has already thought carefully about what your lakefile.toml should look like!)

But if you ask for a lakefile.toml from a webpage based AI, you should expect unverified hallucination.