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rust source #1
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mrustc (master)
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macro_rules! identity { ($(i:item)*) => { $($i)* }; } macro_rules! cfg_if { // match if/else chains with a final `else` ($( if #[cfg($($meta:meta),*)] { $($it:item)* } ) else * else { $($it2:item)* }) => { cfg_if! { @__items () ; $( ( ($($meta),*) ($($it)*) ), )* ( () ($($it2)*) ), } }; // match if/else chains lacking a final `else` ( if #[cfg($($i_met:meta),*)] { $($i_it:item)* } $( else if #[cfg($($e_met:meta),*)] { $($e_it:item)* } )* ) => { cfg_if! { @__items () ; ( ($($i_met),*) ($($i_it)*) ), $( ( ($($e_met),*) ($($e_it)*) ), )* ( () () ), } }; // Internal and recursive macro to emit all the items // // Collects all the negated cfgs in a list at the beginning and after the // semicolon is all the remaining items (@__items ($($not:meta,)*) ; ) => {}; (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ), $($rest:tt)*) => { // Emit all items within one block, applying an approprate #[cfg]. The // #[cfg] will require all `$m` matchers specified and must also negate // all previous matchers. cfg_if! { @__apply cfg(all($($m,)* not(any($($not),*)))), $($it)* } // Recurse to emit all other items in `$rest`, and when we do so add all // our `$m` matchers to the list of `$not` matchers as future emissions // will have to negate everything we just matched as well. cfg_if! { @__items ($($not,)* $($m,)*) ; $($rest)* } }; // Internal macro to Apply a cfg attribute to a list of items (@__apply $m:meta, $($it:item)*) => { $(#[$m] identity! { $it })* }; } cfg_if! { if #[cfg(target_arch = "not_a_target")] { async fn foo() {} } }
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