Tests on nightly failed as it attempted to use proc_macro2::TokenStream in pub signatures.
Instead of importing proc_macro2 as proc_macro we import either proc_macro or proc_macro2 as tokens and use that as a faux crate name everywhere, so that proc_macro::TokenStream always resolves to the correct, undecorated TokenStream.
Tests on nightly failed as it attempted to use
proc_macro2::TokenStreamin pub signatures.Instead of importing
proc_macro2 as proc_macrowe import eitherproc_macroorproc_macro2astokensand use that as a faux crate name everywhere, so thatproc_macro::TokenStreamalways resolves to the correct, undecoratedTokenStream.