Removed a copious amount of premature Rc-s

src/interner/mod.rs

@@ -2,24 +2,12 @@
 //!
 //! Can be used to deduplicate various structures for fast equality comparisons.
 //! The parser uses it to intern strings.
-mod display;
 mod monotype;
 mod multitype;
 mod token;
+mod traits;
 
-pub use display::{DisplayBundle, InternedDisplay};
 pub use monotype::TypedInterner;
 pub use multitype::Interner;
 pub use token::Tok;
-
-/// A symbol, nsname, nname or namespaced name is a sequence of namespaces
-/// and an identifier. The [Vec] can never be empty.
-///
-/// Throughout different stages of processing, these names can be
-///
-/// - local names to be prefixed with the current module
-/// - imported names starting with a segment
-///   - ending a single import or
-///   - defined in one of the glob imported modules
-/// - absolute names
-pub type Sym = Tok<Vec<Tok<String>>>;
+pub use traits::{DisplayBundle, InternedDisplay, InternedInto};

src/interner/traits.rs

@@ -54,3 +54,18 @@ impl<'a, T: InternedDisplay + ?Sized> Display for DisplayBundle<'a, T> {
     self.data.fmt_i(f, self.interner)
   }
 }
+
+/// Conversions that are possible in the presence of an interner
+///
+/// Essentially, this allows to define abstractions over interned and
+/// non-interned versions of a type and convert between them
+pub trait InternedInto<U> {
+  /// Execute the conversion
+  fn into_i(self, i: &Interner) -> U;
+}
+
+impl<T: Into<U>, U> InternedInto<U> for T {
+  fn into_i(self, _i: &Interner) -> U {
+    self.into()
+  }
+}