Add TypeName

Author: soutaro

rust/ruby-rbs/src/ids.rs

@@ -125,6 +125,13 @@ pub enum SymbolTag {}
 /// string bytes.
 pub type SymbolId = Id<SymbolTag>;
 
+/// Tag for IDs produced by the type-name interner.
+pub enum TypeNameTag {}
+
+/// Identifier for an interned type name. Content-addressed: derived from
+/// the parent type name's hash and the last segment's hash.
+pub type TypeName = Id<TypeNameTag>;
+
 #[cfg(test)]
 mod tests {
     use super::*;

rust/ruby-rbs/src/lib.rs

@@ -1,3 +1,4 @@
 pub mod ids;
 pub mod interner;
 pub mod node;
+pub mod type_name;