Replace try! macro

ff/ff_derive/src/lib.rs

@@ -122,9 +122,9 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
         impl ::std::fmt::Debug for #repr
         {
             fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-                try!(write!(f, "0x"));
+                write!(f, "0x")?;
                 for i in self.0.iter().rev() {
-                    try!(write!(f, "{:016x}", *i));
+                    write!(f, "{:016x}", *i)?;
                 }
 
                 Ok(())
@@ -133,9 +133,9 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
 
         impl ::std::fmt::Display for #repr {
             fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-                try!(write!(f, "0x"));
+                write!(f, "0x")?;
                 for i in self.0.iter().rev() {
-                    try!(write!(f, "{:016x}", *i));
+                    write!(f, "{:016x}", *i)?;
                 }
 
                 Ok(())

zcash_primitives/src/jubjub/fs.rs

@@ -75,9 +75,9 @@ pub struct FsRepr(pub [u64; 4]);
 
 impl ::std::fmt::Display for FsRepr {
     fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-        r#try!(write!(f, "0x"));
+        r#write!(f, "0x")?;
         for i in self.0.iter().rev() {
-            r#try!(write!(f, "{:016x}", *i));
+            r#write!(f, "{:016x}", *i)?;
         }
 
         Ok(())