for_all_feature_combinations

sqlx_core_oldapi

Macro for_all_feature_combinations 

Source 
macro_rules! for_all_feature_combinations {
    ( entries: [ $( ( $feat:literal, $payload:tt ) ),* $(,)? ], callback: $callback:ident ) => { ... };
    (@recurse [$($yes:tt)*] [$($no:tt)*] [ ( $feat:literal, $payload:tt ) $($rest:tt)* ] $callback:ident ) => { ... };
    (@recurse [ $( ( $yfeat:literal, $ypayload:tt ) )+ ] [ $( $nfeat:literal )* ] [] $callback:ident ) => { ... };
    (@recurse [] [ $( $nfeat:literal )* ] [] $callback:ident ) => { ... };
}