Failing spec on crystal master

[straight-shoota]

With current master of the compiler, an ameba spec fails:

  1) Ameba::AST::Assignment #transformed? returns true if the assignment is transformed by the compiler

       Empty enumerable (Enumerable::EmptyError)
         from /usr/share/crystal/src/enumerable.cr:534:13 in 'first'
         from spec/ameba/ast/variabling/assignment_spec.cr:109:37 in '->'
         from /usr/share/crystal/src/spec/example.cr:45:13 in 'internal_run'
         from /usr/share/crystal/src/spec/example.cr:33:16 in 'run'
         from /usr/share/crystal/src/spec/context.cr:18:23 in 'internal_run'
         from /usr/share/crystal/src/spec/context.cr:342:7 in 'run'
         from /usr/share/crystal/src/spec/context.cr:18:23 in 'internal_run'
         from /usr/share/crystal/src/spec/context.cr:342:7 in 'run'
         from /usr/share/crystal/src/spec/context.cr:18:23 in 'internal_run'
         from /usr/share/crystal/src/spec/context.cr:158:7 in 'run'
         from /usr/share/crystal/src/spec/dsl.cr:212:7 in '->'
         from /usr/share/crystal/src/crystal/at_exit_handlers.cr:14:19 in 'run'
         from /usr/share/crystal/src/crystal/main.cr:64:14 in 'exit'
         from /usr/share/crystal/src/crystal/main.cr:59:5 in 'main'
         from /usr/share/crystal/src/crystal/main.cr:141:3 in 'main'
         from /lib/x86_64-linux-gnu/libc.so.6 in '??'
         from /lib/x86_64-linux-gnu/libc.so.6 in '__libc_start_main'
         from /root/.cache/crystal/crystal-run-spec.tmp in '_start'
         from ???

https://github.com/crystal-lang/test-ecosystem/actions/runs/6428749143/job/17456492697

This is most likely caused by crystal-lang/crystal#11597 which changed the AST of packed block parameters.