# SSTT
More **S**yn **S**yntax **T**ree **T**raversal Trait
  
SSTT crate provide some useful trait for syn syntax tree traversal.
## Example
fallible [Fold](https://docs.rs/syn/latest/syn/fold/index.html)
```rust
pub trait TryFold {
type Error;
fn try_fold_abi(&mut self, t: syn::Abi) -> Result
{
try_fold_abi(self, t)
}
// ...
}
```
fallible take (like fold but without return new value)
```rust
pub trait TryTake {
type Error;
fn try_take_abi(&mut self, t: syn::Abi) -> Result<(), Self::Error> {
try_take_abi(self, t)
}
// ...
}
```