style: format errors6 with rustfmt

exercises/error_handling/errors6.rs

@@ -16,7 +16,7 @@ use std::num::ParseIntError;
 #[derive(PartialEq, Debug)]
 enum ParsePosNonzeroError {
     Creation(CreationError),
-    ParseInt(ParseIntError)
+    ParseInt(ParseIntError),
 }
 
 impl ParsePosNonzeroError {
@@ -27,14 +27,11 @@ impl ParsePosNonzeroError {
     // fn from_parseint...
 }
 
-fn parse_pos_nonzero(s: &str)
+fn parse_pos_nonzero(s: &str) -> Result<PositiveNonzeroInteger, ParsePosNonzeroError> {
-    -> Result<PositiveNonzeroInteger, ParsePosNonzeroError>
-{
     // TODO: change this to return an appropriate error instead of panicking
     // when `parse()` returns an error.
     let x: i64 = s.parse().unwrap();
-    PositiveNonzeroInteger::new(x)
+    PositiveNonzeroInteger::new(x).map_err(ParsePosNonzeroError::from_creation)
-        .map_err(ParsePosNonzeroError::from_creation)
 }
 
 // Don't change anything below this line.
@@ -53,7 +50,7 @@ impl PositiveNonzeroInteger {
         match value {
             x if x < 0 => Err(CreationError::Negative),
             x if x == 0 => Err(CreationError::Zero),
-            x => Ok(PositiveNonzeroInteger(x as u64))
+            x => Ok(PositiveNonzeroInteger(x as u64)),
         }
     }
 }