remove java implementation, was merely a book copy

rust/rox/src/expression.rs

@@ -1,54 +0,0 @@
-use crate::token::{self, Token};
-
-/// Enumeration of all types of expressions.
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub enum Expression {
-    Assign {
-        name: Token,
-        value: Box<Expression>,
-    },
-    Binary {
-        left: Box<Expression>,
-        operator: Token,
-        right: Box<Expression>,
-    },
-    Call {
-        callee: Box<Expression>,
-        paren: Token,
-        args: Vec<Expression>,
-    },
-    Get {
-        object: Box<Expression>,
-        name: Token,
-    },
-    Set {
-        object: Box<Expression>,
-        name: Token,
-        value: Box<Expression>,
-    },
-    This {
-        keyword: Token,
-    },
-    Grouping {
-        expression: Box<Expression>,
-    },
-    Literal {
-        value: token::Literal,
-    },
-    Logical {
-        left: Box<Expression>,
-        operator: Token,
-        right: Box<Expression>,
-    },
-    Unary {
-        operator: Token,
-        right: Box<Expression>,
-    },
-    Variable {
-        name: Token,
-    },
-    Super {
-        keyword: Token,
-        method: Token,
-    },
-}