Replace proc-macro-error

[max-sixty]

Currently the only dependency that use syn v1 in PRQL's dependencies is from test-each-file. Given how large syn is, this slows down our compile times.

I think that's from proc-macro-error, which isn't maintained:

$ cargo tree -i syn@1

syn v1.0.109
└── proc-macro-error v1.0.4
    └── test_each_file v0.3.1 (proc-macro)

I think there are some replacements for that crate — to the extent it's possible, could that it be replaced?

[JonathanBrouwer]

That's a good point. I'm going to take a look at how feasible replacing this dependency is tonight

[Vlamonster]

Issue is resolved in version 0.3.2.

[max-sixty]

Thanks @Vlamonster !