Add errors6

exercises/error_handling/errors6.rs

@@ -8,8 +8,6 @@
 
 // Execute `rustlings hint errors6` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 use std::num::ParseIntError;
 
 // This is a custom error type that we will be using in `parse_pos_nonzero()`.
@@ -24,15 +22,18 @@ impl ParsePosNonzeroError {
         ParsePosNonzeroError::Creation(err)
     }
     // TODO: add another error conversion function here.
-    fn from_parseint(err: ParseIntError) -> ParseIntError {
-        ParseIntError::ParseInt(err);
+    fn from_parseint(err: ParseIntError) -> ParsePosNonzeroError {
+        ParsePosNonzeroError::ParseInt(err)
     }
 }
 
 fn parse_pos_nonzero(s: &str) -> 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();
+    let x: i64 = match s.parse::<i64>() {
+        Err(err) => return Err(ParsePosNonzeroError::ParseInt(err)),
+        Ok(n) => n
+    };
     PositiveNonzeroInteger::new(x).map_err(ParsePosNonzeroError::from_creation)
 }