Remove ValueWithKey struct

While using this library, I end up having lifetime issues with
`Config::get`. I've seen that current implementation forces the calleer
to match `key` lifetime to the output of the function.

My use case is, under some circumstances, return a suffixed version of
the config key. Something similar to:

```
        if some_condition == true {
            let key_name = format!("{}_suffix", key);
            self.config.get(&key_name)
        } else {
	    self.config.get(key)
	}
```

This code is noy compiling for me due to conflicting lifetimes. To avoid
this, I've started looking to the code and  I've found that `key` needed
this lifetime because of `ValueWithKey`. The purpouse of this struct
seems to be add more information to the errors that are returned to the
user.

To mitigate this lifetime coupling I've:

- Mapped the error on `Config::get` to include the originating key of
  the current error
- Remove all the code related with `ValueWithKey`

1 files changed, 0 insertions, 55 deletions

diff --git a/src/value.rs b/src/value.rs
index 1bba78c..2db195d 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -542,58 +542,3 @@ impl Display for Value {
         write!(f, "{}", self.kind)
     }
 }
-
-pub struct ValueWithKey<'a>(pub Value, &'a str);
-
-impl<'a> ValueWithKey<'a> {
-    pub fn new(value: Value, key: &'a str) -> Self {
-        ValueWithKey(value, key)
-    }
-
-    pub fn into_bool(self) -> Result<bool> {
-        match self.0.into_bool() {
-            Ok(value) => Ok(value),
-            Err(error) => Err(error.extend_with_key(self.1)),
-        }
-    }
-
-    /// Returns `self` into an i64, if possible.
-    pub fn into_int(self) -> Result<i64> {
-        match self.0.into_int() {
-            Ok(value) => Ok(value),
-            Err(error) => Err(error.extend_with_key(self.1)),
-        }
-    }
-
-    /// Returns `self` into a f64, if possible.
-    pub fn into_float(self) -> Result<f64> {
-        match self.0.into_float() {
-            Ok(value) => Ok(value),
-            Err(error) => Err(error.extend_with_key(self.1)),
-        }
-    }
-
-    /// Returns `self` into a str, if possible.
-    pub fn into_str(self) -> Result<String> {
-        match self.0.into_str() {
-            Ok(value) => Ok(value),
-            Err(error) => Err(error.extend_with_key(self.1)),
-        }
-    }
-
-    /// Returns `self` into an array, if possible
-    pub fn into_array(self) -> Result<Vec<Value>> {
-        match self.0.into_array() {
-            Ok(value) => Ok(value),
-            Err(error) => Err(error.extend_with_key(self.1)),
-        }
-    }
-
-    /// If the `Value` is a Table, returns the associated Map.
-    pub fn into_table(self) -> Result<HashMap<String, Value>> {
-        match self.0.into_table() {
-            Ok(value) => Ok(value),
-            Err(error) => Err(error.extend_with_key(self.1)),
-        }
-    }
-}