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55b6f649024b372af901b3412a6d36c4284ccf3d
rust/tests/ui/proc-macro/auxiliary/meta-delim.rs

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Handle `None`-delimited groups when parsing `macro_rules!` macro When a `macro_rules!` macro expands to another `macro_rules!` macro, we may see `None`-delimited groups in odd places when another crate deserializes the 'inner' macro. This commit 'unwraps' an outer `None`-delimited group to avoid breaking existing code. See https://github.com/rust-lang/rust/pull/73569#issuecomment-650860457 for more details. The proper fix is to handle `None`-delimited groups systematically throughout the parser, but that will require significant work. In the meantime, this hack lets us fix important hygiene bugs in macros
2020-06-29 09:55:28 -04:00
macro_rules! produce_it {
($dollar_one:tt $foo:ident $my_name:ident) => {
#[macro_export]
macro_rules! meta_delim {
($dollar_one ($dollar_one $my_name:ident)*) => {
stringify!($dollar_one ($dollar_one $my_name)*)
}
}
}
}
produce_it!($my_name name);
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