修复EOF飘逸（去除末尾\n)以及其他修复...

src/Ast/Expr/IndexExpr.hpp

@@ -0,0 +1,34 @@
+/*!
+    @file src/Ast/Expr/IndexExpr.hpp
+    @brief IndexExpr定义
+    @author PuqiAR (im@puqiar.top)
+    @date 2026-02-17
+*/
+
+#pragma once
+
+#include <Ast/Base.hpp>
+
+namespace Fig
+{
+    struct IndexExpr final : public Expr
+    {
+        Expr *base;
+        Expr *index;
+
+        IndexExpr()
+        {
+            type = AstType::IndexExpr;
+        }
+
+        IndexExpr(Expr *_base, Expr *_index) : base(_base), index(_index)
+        {
+            location = base->location;
+        }
+
+        virtual String toString() const override
+        {
+            return std::format("<IndexExpr: '{}[{}]'>", base->toString(), index->toString());
+        }
+    };
+}; // namespace Fig