Spans empty in `proc-macro2 >= 1.0.57`

[MingweiSamuel]

Currently working with syn 2.0.14, seems broken in syn 2.0.18

[MingweiSamuel]

broken by

 Updating proc-macro2 v1.0.56 -> v1.0.60
 Updating quote v1.0.26 -> v1.0.28
 Updating syn v2.0.16 -> v2.0.17

[MingweiSamuel]

broken by proc-macro2 >= 1.0.57

dtolnay/proc-macro2#383

[MingweiSamuel]

waiting for rust-lang/rust#111571 to trickle through the ecosystem