Introduction chapter: Getting an error on assertTypeCmd in Lean4

[lakesare]

I'm getting the following error in the Introduction#Building a command example.
My Lean version is "leanprover/lean4:nightly-2022-10-09". Does this look familiar?

[arthurpaulino]

Oh, the API must have changed. What happens if you don't pass the `assertTypeCmd argument?

[lakesare]

It goes like this:

[arthurpaulino]

@lakesare I've bumped the toolchain and fixed that issue: https://github.com/arthurpaulino/lean4-metaprogramming-book/commit/ec355bba83e3d65db57952f13abc23a32cafd009

Make sure to check the indentation levels of your code because the try ... needs to be deeper than liftTermElabM

[lakesare]

That worked! Thanks for the note about the nesting level, that was also important.