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@JerryQ17
Description
rust-lang/rust#143070 rewrites macro_rules! parser to not use the MBE engine itself.
The following is the relevant section (39.2 Macro expansion):
rustc-dev-guide/src/macro-expansion.md
Lines 557 to 559 in 0549d8c
When the compiler comes to a `macro_rules` definition, it uses this pattern to
match the two token trees per the rules of the definition of the macro, _thereby
utilizing the macro parser itself_. In our example definition, the