add chapter: fighting with compiler

solutions/fight-compiler/borrowing.md

@@ -0,0 +1,26 @@
+1.
+```rust
+struct test {
+    list: Vec<i32>,
+    a: i32
+}
+
+impl test {
+    pub fn new() -> Self {
+        test { list:vec![1,2,3,4,5,6,7], a:0 }
+    }
+
+    pub fn run(&mut self) {
+        for i in 0..self.list.len() {
+            self.do_something(self.list[i])
+        }
+
+    }
+
+    pub fn do_something(&mut self, n: i32) {
+        self.a = n;
+    }
+}
+
+fn main() {}
+```