Attribute Macro syncify 

#[syncify]

Try to make code non-async by removing async and .await keywords.

You can add customized replace logic if the default is not sufficient. For example, use #[syncify([<B: Future<Output=K>>] => [], [B] => [K])] to remove <B: Future<Output=K>> and replace B with K. You can also use pattern matching, like[BoxStream<__1>] => [Iterator<__1>]. The placeholder names affect what they match:

• __1: double underscore, without g: match a single token that is not a group (not { ... }, ( ... )).
• __1g: double underscore, with g: match a single token that can also be a group.
• ___1: triple underscore, without g: match zero or more tokens, do not match groups.
• ___1g: triple underscore, with g: match zero or more tokens, including groups.

Use debug in proc macro attribute to turn on extra output about expanded code. You can also use cargo expand.