Rename try to avoid keyword

Author: SSheldon

src/exception.rs

@@ -3,7 +3,7 @@ use objc_exception;
 use crate::rc::StrongPtr;
 use crate::runtime::Object;
 
-pub unsafe fn r#try<F, R>(closure: F) -> Result<R, StrongPtr>
+pub unsafe fn catch_exception<F, R>(closure: F) -> Result<R, StrongPtr>
         where F: FnOnce() -> R {
     objc_exception::r#try(closure).map_err(|exception| {
         StrongPtr::new(exception as *mut Object)

src/message/mod.rs

@@ -9,7 +9,7 @@ use crate::{Encode, EncodeArguments};
 #[cfg(feature = "exception")]
 macro_rules! objc_try {
     ($b:block) => (
-        $crate::exception::r#try(|| $b).map_err(|exception|
+        $crate::exception::catch_exception(|| $b).map_err(|exception|
             if exception.is_null() {
                 MessageError("Uncaught exception nil".to_owned())
             } else {