pub fn push_struct(&mut self, pattern: impl Into<String>, attr: impl Into<String>) {
        self.structure.push((pattern.into(), attr.into()));
    }
Add an attribute that will be added to `struct` items matching the given pattern.

# Examples

```
# use tonic_build::*;
let mut attributes = Attributes::default();
attributes.push_struct("EchoService", "#[derive(PartialEq)]");
```
tonic-build/src/lib.rs