Remove mac
, syn
, `quote
, and proc_macro2
dependencies
#663
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Removes unncessary dependencies
syn
, ``quote, and
proc_macro2` dependencies are no longer used since Replacematch_token!
proc macro withtag!
macro_rules macro #640mac
crate is an old crate with utility macros that are easily replaced with language features like?
andlet-else
in modern Rust