CI: Pin syn and proc-macro2 versions for kani@v0.49.0
#419
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Fixes #418.
As of April 16, 2024, the latest version
0.49.0of Kani verifier uses Rustnightly-2024-03-29, which cannot compileproc-macro2@1.0.80, causing a CI job to tail.To address the issue, a new version of Kani will be released soon (model-checking/kani#3144). But for now, we workaround the issue by pining some crate versions to older versions.
This PR does the followings when running GitHub CI for Kani verifier:
proc-macro2to1.0.79.synto2.0.58.proc-macro2version requires downgradingsyn.