move old files to a separate directory

old_curriculum/macros/macros1.rs

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+// macros1.rs
+// Make me compile! Scroll down for hints :)
+
+macro_rules! my_macro {
+    () => {
+        println!("Check out my macro!");
+    };
+}
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+fn main() {
+    my_macro();
+}
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+// When you call a macro, you need to add something special compared to a
+// regular function call. If you're stuck, take a look at what's inside
+// `my_macro`.

old_curriculum/macros/macros2.rs

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+// macros2.rs
+// Make me compile! Scroll down for hints :)
+
+fn main() {
+    my_macro!();
+}
+
+macro_rules! my_macro {
+    () => {
+        println!("Check out my macro!");
+    };
+}
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+// Macros don't quite play by the same rules as the rest of Rust, in terms of
+// what's available where.
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+// Unlike other things in Rust, the order of "where you define a macro" versus
+// "where you use it" actually matters.

old_curriculum/macros/macros3.rs

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+// macros3.rs
+// Make me compile, without taking the macro out of the module! Scroll down for hints :)
+
+mod macros {
+    macro_rules! my_macro {
+        () => {
+            println!("Check out my macro!");
+        };
+    }
+}
+
+fn main() {
+    my_macro!();
+}
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+// In order to use a macro outside of its module, you need to do something
+// special to the module to lift the macro out into its parent.
+
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+// The same trick also works on "extern crate" statements for crates that have
+// exported macros, if you've seen any of those around.

old_curriculum/macros/macros4.rs

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+// macros4.rs
+// Make me compile! Scroll down for hints :)
+
+macro_rules! my_macro {
+    () => {
+        println!("Check out my macro!");
+    }
+    ($val:expr) => {
+        println!("Look at this other macro: {}", $val);
+    }
+}
+
+fn main() {
+    my_macro!();
+    my_macro!(7777);
+}
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+// You only need to add a single character to make this compile.
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+// The way macros are written, it wants to see something between each
+// "macro arm", so it can separate them.