Move towards upstream macro_rules!
model
#14
Merged
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Upstream Rust has long since considered
macro_rules!
to be an item declaration instead of a macro invocation. Additionally, macro invocations cannot have a "name" between thepath::to::macro!
and the argument token tree.This PR moves ungrammar closer to that model, and also allows visibility on
MacroRules
items, which has been proposed in rust-lang/rust#78166.