finished resolver (chapter 11) and started classes (chapter 12)

interpreter/src/class.rs

@@ -0,0 +1,19 @@
+use std::fmt::Display;
+
+#[derive(Debug)]
+pub struct LoxClass {
+    name: String,
+}
+
+impl LoxClass {
+    pub fn new(name: impl Into<String>) -> Self {
+        let name = name.into();
+        LoxClass { name }
+    }
+}
+
+impl Display for LoxClass {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "<class {}>", self.name)
+    }
+}