Error during code generation: unsupported proc macro punctuation character '{'

[sunnyrains]

after running
~/Desktop/avr-device$ make atmega32a

-e MAKEDEPS atmega4808
-e MAKEDEPS atmega32u4
-e MAKEDEPS atmega32a
-e MAKEDEPS atmega328pb
-e MAKEDEPS atmega328p
-e MAKEDEPS atmega324pa
-e MAKEDEPS atmega8u2
-e MAKEDEPS atmega8
-e MAKEDEPS atmega2560
-e MAKEDEPS atmega168
-e MAKEDEPS atmega164pa
-e MAKEDEPS atmega16
-e MAKEDEPS atmega128rfa1
-e MAKEDEPS atmega128a
-e MAKEDEPS atmega1284p
-e MAKEDEPS atmega1280
-e MAKEDEPS at90usb1286
-e ATDF2SVD atmega32a
-e PATCH atmega32a
-e SVD2RUST atmega32a
[INFO svd2rust] Parsing device from SVD file
[INFO svd2rust] Rendering device
thread 'main' panicked at /home/bbino/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.87/src/lib.rs:847:13:
unsupported proc macro punctuation character '{'
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
make: *** [Makefile:38: src/devices/atmega32a/mod.full.rs] Error 101

[Arian8j2]

faced exact issue today, backtrace shows this:

unsupported proc macro punctuation character '{'
stack backtrace:
   0: rust_begin_unwind
   1: core::panicking::panic_fmt
   2: proc_macro2::Punct::new
   3: svd2rust::generate::register::render_register_mod
   4: svd2rust::generate::register::render
   5: svd2rust::generate::peripheral::render_ercs
   6: svd2rust::generate::peripheral::render
   7: svd2rust::generate::device::render
   8: svd2rust::run
   9: svd2rust::main

it's clearly svd2rust issue that comes from a breaking change commit in proc-macro2, and not related to avr-device.
until the problem get fixed in svd2rust you can get around it by installing sv2rust by running this command:

cargo install svd2rust --locked