From 3c70fdf3b9f4994e6087e046328d4cb1f809c92b Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Thu, 30 Jan 2020 22:15:35 +0800
Subject: [PATCH] add lazy_static

---
 lazy_static/Cargo.toml  | 10 ++++++++++
 lazy_static/src/main.rs | 10 ++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 lazy_static/Cargo.toml
 create mode 100644 lazy_static/src/main.rs

diff --git a/lazy_static/Cargo.toml b/lazy_static/Cargo.toml
new file mode 100644
index 0000000..2b52baf
--- /dev/null
+++ b/lazy_static/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "lazy_static"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+lazy_static = "1.4.0"
diff --git a/lazy_static/src/main.rs b/lazy_static/src/main.rs
new file mode 100644
index 0000000..04f5393
--- /dev/null
+++ b/lazy_static/src/main.rs
@@ -0,0 +1,10 @@
+#[macro_use]
+extern crate lazy_static;
+
+lazy_static! {
+    static ref USER_HOME: Option<String> = std::env::var("HOME").ok();
+}
+
+fn main() {
+    println!("User home: {:?}", *USER_HOME);
+}