зеркало из https://github.com/mozilla/fxrecord.git
ba32575185
The new message implementation macro, `message_ty!`, is written as a
procedural macro to make the maintenance burden easier. Declarative
macros may be conceptually simpler, but attempting to make
`impl_message!` work for either `struct` or `enum` members was *hard*
and got very messy very fast.
Additionally [rust#22694][rust22694] prevents using declarative macros
to generate item fragments (e.g., enum variants inside `enum Foo {}`),
which makes creating a maintainable decl macro quite hard.
It ended up being less effort to both rewrite it as a proc macro and
also add support for `enum` members. As a side effect, this macro
provides better error spans when it is provided with invalid input
(instead of the generic `no rules expected the token {token}` error).
[rust22694]: https://github.com/rust-lang/rust/issues/22694
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