Introduce PackageName::to_str and From instance

compiler/parse/src/header.rs

@@ -53,7 +53,29 @@ pub enum VersionComparison {
 }
 
 #[derive(Copy, Clone, PartialEq, Debug)]
-pub struct PackageName<'a>(pub &'a str);
+pub struct PackageName<'a>(&'a str);
+
+impl<'a> PackageName<'a> {
+    pub fn to_str(self) -> &'a str {
+        self.0
+    }
+
+    pub fn as_str(&self) -> &'a str {
+        self.0
+    }
+}
+
+impl<'a> From<PackageName<'a>> for &'a str {
+    fn from(name: PackageName<'a>) -> &'a str {
+        name.0
+    }
+}
+
+impl<'a> From<&'a str> for PackageName<'a> {
+    fn from(string: &'a str) -> Self {
+        Self(string)
+    }
+}
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
 pub struct ModuleName<'a>(&'a str);