1 files changed, 23 insertions, 0 deletions
diff --git a/meap/meap-code/ch3/ch3-not-quite-file-1.rs b/meap/meap-code/ch3/ch3-not-quite-file-1.rs
new file mode 100644
index 0000000..292d7ab
--- /dev/null
+++ b/meap/meap-code/ch3/ch3-not-quite-file-1.rs
@@ -0,0 +1,23 @@
+#![allow(unused_variables)] // <1> Relax compiler warnings while working through ideas
+
+type File = String; // <2> Create a type alias. The compiler won't distinguish between String & File, but your source code will.
+
+fn open(f: &mut File) -> bool {
+    true // <3> let's assume for the moment that this always succeeds
+}
+
+fn close(f: &mut File) -> bool {
+    true // <3>
+}
+
+#[allow(dead_code)] // <4> Relaxes a compiler warning about an unused function
+fn read(f: &mut File, save_to: &mut Vec<u8>) -> ! { // <5> Using `!` as a return type indicates to the Rust compiler that this function never returns
+    unimplemented!() // <6> A macro that crashes the program if it is encountered
+}
+
+fn main() {
+    let mut f1 = File::from("f1.txt"); // <7> With the type declaration at line 3, `File` "inherits" all of String's methods 
+    open(&mut f1);
+    //read(f1 , vec![]); // <8> There's little point in calling this method
+    close(&mut f1);
+}
+\ No newline at end of file