tracing.jl notebook will not build

[nathanrboyer]

┌ Error: error when executing notebook based on input file: `<path>\diff-zoo\src\tracing.jl`
└ @ Literate <path>\.julia\packages\Literate\3qT7A\src\Literate.jl:555
ERROR: LoadError: LoadError: syntax: unexpected semicolon in tuple around string:1
in expression starting at string:1
when executing the following code block

@eval dcube(x) = $(Expr(dy))

dcube(5)

If I comment out these lines, then the next lines error too.
I tested with Julia 1.6 and 1.10 and with Literate v2.2.0 and v2.16.0. All had the same error.
There is also a Pkg error updating dependency versions unless name = "diff-zoo" is removed from the Project.toml.