docs.rs cannot generate the documentation for rustpython-parser #4436

rustpython-parser 0.2.0 has just been published on crates.io, unfortunately docs.rs appears to be unable to generate the documentation. The relevant line in the log appears to be:

[INFO] [stderr] thread 'main' panicked at 'running lalrpop failed. Os { code: 30, kind: ReadOnlyFilesystem, message: "Read-only file system" }', build.rs:79:9

Quoting the docs.rs documentation:

Most of the sandbox is a read-only file system, including the source directory of your crate and its dependencies. If your build.rs generates files that are relevant for documentation, consider writing to the cargo output directory, passed in the environment variable OUT_DIR.

So the compiler/parser/build.rs script should be updated accordingly. I'll try to make a PR :)