From 55a1fa90b176962c2054714b2b734d4a46e298ae Mon Sep 17 00:00:00 2001
From: Andrew Johnson <andrewjohnson@Andrews-MacBook-Pro.local>
Date: Fri, 25 May 2018 14:23:22 -0600
Subject: [PATCH] procmacro

---
 Chapter09/Cargo.toml                   |  5 +++++
 Chapter09/metaprogramming_procmacro.rs |  7 +++++++
 Chapter09/procmacro/.gitignore         |  2 ++
 Chapter09/procmacro/Cargo.toml         | 10 ++++++++++
 Chapter09/procmacro/src/lib.rs         | 15 +++++++++++++++
 5 files changed, 39 insertions(+)
 create mode 100644 Chapter09/metaprogramming_procmacro.rs
 create mode 100644 Chapter09/procmacro/.gitignore
 create mode 100644 Chapter09/procmacro/Cargo.toml
 create mode 100644 Chapter09/procmacro/src/lib.rs

diff --git a/Chapter09/Cargo.toml b/Chapter09/Cargo.toml
index 1c59afa..9ac979d 100644
--- a/Chapter09/Cargo.toml
+++ b/Chapter09/Cargo.toml
@@ -7,6 +7,7 @@ flame = "0.2"
 rand = "0.4.2"
 requests = "0.0.30"
 rusty-machine = "0.5.4"
+procmacro = { path = "procmacro" }
 
 [[bin]]
 name = "performance_release_mode"
@@ -91,3 +92,7 @@ path = "metaprogramming_grammar.rs"
 [[bin]]
 name = "metaprogramming_ebnf"
 path = "metaprogramming_ebnf.rs"
+
+[[bin]]
+name = "metaprogramming_procmacro"
+path = "metaprogramming_procmacro.rs"
diff --git a/Chapter09/metaprogramming_procmacro.rs b/Chapter09/metaprogramming_procmacro.rs
new file mode 100644
index 0000000..f5454ed
--- /dev/null
+++ b/Chapter09/metaprogramming_procmacro.rs
@@ -0,0 +1,7 @@
+#![feature(proc_macro_non_items)]
+#![feature(use_extern_macros)]
+extern crate procmacro;
+
+fn main() {
+   let _ = procmacro::f!();
+}
diff --git a/Chapter09/procmacro/.gitignore b/Chapter09/procmacro/.gitignore
new file mode 100644
index 0000000..fa8d85a
--- /dev/null
+++ b/Chapter09/procmacro/.gitignore
@@ -0,0 +1,2 @@
+Cargo.lock
+target
diff --git a/Chapter09/procmacro/Cargo.toml b/Chapter09/procmacro/Cargo.toml
new file mode 100644
index 0000000..486370b
--- /dev/null
+++ b/Chapter09/procmacro/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "procmacro"
+version = "1.0.0"
+
+[dependencies]
+syn = "0.12"
+quote = "0.4"
+
+[lib]
+proc-macro = true
diff --git a/Chapter09/procmacro/src/lib.rs b/Chapter09/procmacro/src/lib.rs
new file mode 100644
index 0000000..50798af
--- /dev/null
+++ b/Chapter09/procmacro/src/lib.rs
@@ -0,0 +1,15 @@
+#![feature(proc_macro)]
+#![crate_type = "proc-macro"]
+extern crate proc_macro;
+extern crate syn;
+#[macro_use] extern crate quote;
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn f(input: TokenStream) -> TokenStream {
+    assert!(input.is_empty());
+
+    (quote! {
+       1 + 2
+    }).into()
+}