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ade49a9fd2
This is to resolve the following clippy issues: error[E0635]: unknown feature `proc_macro_span_shrink` --> /home/chenb/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.47/src/lib.rs:92:30 | 92 | feature(proc_macro_span, proc_macro_span_shrink) | ^^^^^^^^^^^^^^^^^^^^^^ Signed-off-by: Bo Chen <chen.bo@intel.com>