diff --git a/__std/misc/Cargo.lock b/__std/misc/Cargo.lock
new file mode 100644
index 0000000..83ec7fb
--- /dev/null
+++ b/__std/misc/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "misc"
+version = "0.1.0"
diff --git a/__std/misc/Cargo.toml b/__std/misc/Cargo.toml
new file mode 100644
index 0000000..2c55c9f
--- /dev/null
+++ b/__std/misc/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "misc"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/__std/misc/src/bin/channel_test.rs b/__std/misc/src/bin/channel_test.rs
new file mode 100644
index 0000000..ea43aa3
--- /dev/null
+++ b/__std/misc/src/bin/channel_test.rs
@@ -0,0 +1,31 @@
+use std::sync::mpsc::channel;
+use std::thread;
+
+fn main() {
+    let (sender, receiver) = channel::<Option<i32>>();
+
+    let h = thread::spawn(move || {
+        loop {
+            match receiver.recv() {
+                Ok(o) => match o {
+                    None => {
+                        println!("The end!");
+                        return;
+                    }
+                    Some(i) => println!("Received: {}", i),
+                }
+                Err(e) => { // when sender closed
+                    println!("Error: {}", e);
+                    return;
+                }
+            }
+        }
+    });
+
+    sender.send(Some(1)).unwrap();
+    sender.send(Some(2)).unwrap();
+    sender.send(Some(3)).unwrap();
+    sender.send(None).unwrap();
+
+    h.join().unwrap();
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/dynamic_bind_test.rs b/__std/misc/src/bin/dynamic_bind_test.rs
new file mode 100644
index 0000000..887f548
--- /dev/null
+++ b/__std/misc/src/bin/dynamic_bind_test.rs
@@ -0,0 +1,20 @@
+trait Say {
+    fn say(&self);
+}
+
+struct Dog {}
+
+impl Say for Dog {
+    fn say(&self) {
+        println!("Wangwang!");
+    }
+}
+
+fn do_say(s: Box<dyn Say>) {
+    s.say();
+}
+
+fn main() {
+    let dog = Dog {};
+    do_say(Box::new(dog));
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/enum_test.rs b/__std/misc/src/bin/enum_test.rs
new file mode 100644
index 0000000..ae17b20
--- /dev/null
+++ b/__std/misc/src/bin/enum_test.rs
@@ -0,0 +1,19 @@
+enum Os {
+    Windows,
+    Linux,
+    Other(String),
+}
+
+fn main() {
+    let os = Os::Other("Unix".to_string());
+    match &os {
+        Os::Windows => println!("OS is Windows."),
+        Os::Other(name) if name == "Unix" => println!("OS is Unix"),
+        Os::Other(name) => println!("OS is other: {}", name),
+        _ => {} // IGNORE
+    }
+
+    // if let Os::Windows = os {
+    //     println!("OS is Windows");
+    // }
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/fn_test.rs b/__std/misc/src/bin/fn_test.rs
new file mode 100644
index 0000000..fb2be67
--- /dev/null
+++ b/__std/misc/src/bin/fn_test.rs
@@ -0,0 +1,8 @@
+fn is_odd(num: i32) -> bool {
+    num % 2 == 1
+}
+
+fn main() {
+    println!("{} is odd: {}", 9, is_odd(9));
+}
+
diff --git a/__std/misc/src/bin/for_test.rs b/__std/misc/src/bin/for_test.rs
new file mode 100644
index 0000000..65242f4
--- /dev/null
+++ b/__std/misc/src/bin/for_test.rs
@@ -0,0 +1,10 @@
+fn main() {
+    for i in 0..100 {
+        println!("#i: {}", i);
+    }
+
+    let arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+    for i in arr {
+        println!("#i: {}", i);
+    }
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/iff_test.rs b/__std/misc/src/bin/iff_test.rs
new file mode 100644
index 0000000..703ae98
--- /dev/null
+++ b/__std/misc/src/bin/iff_test.rs
@@ -0,0 +1,10 @@
+use std::env::args;
+
+#[macro_export] macro_rules! iff {
+    ($c:expr, $t:expr, $f:expr) => ( if $c { $t } else { $f } )
+}
+
+fn main() {
+    let has_arg = iff!(args().skip(1).len() > 0, true, false);
+    println!("Has args: {}", has_arg);
+}
diff --git a/__std/misc/src/bin/loop_test.rs b/__std/misc/src/bin/loop_test.rs
new file mode 100644
index 0000000..84f7f86
--- /dev/null
+++ b/__std/misc/src/bin/loop_test.rs
@@ -0,0 +1,10 @@
+fn main() {
+    let mut i = 0;
+    loop {
+        println!("#i: {}", i);
+        i += 1;
+        if i > 99 {
+            break;
+        }
+    }
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/mutex_test.rs b/__std/misc/src/bin/mutex_test.rs
new file mode 100644
index 0000000..f34e626
--- /dev/null
+++ b/__std/misc/src/bin/mutex_test.rs
@@ -0,0 +1,26 @@
+use std::sync::{Arc, Mutex};
+use std::thread;
+
+fn main() {
+    let count = Arc::new(Mutex::new(0_usize));
+
+    let h1 = {
+        let count = count.clone();
+        thread::spawn(move || {
+            let mut c = count.lock().unwrap();
+            *c += 1;
+            println!("Thread #1: {}", c);
+        })
+    };
+    let h2 = {
+        let count = count.clone();
+        thread::spawn(move || {
+            let mut c = count.lock().unwrap();
+            *c += 1;
+            println!("Thread #2: {}", c);
+        })
+    };
+
+    h1.join().unwrap();
+    h2.join().unwrap();
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/option_test.rs b/__std/misc/src/bin/option_test.rs
new file mode 100644
index 0000000..e0e1d11
--- /dev/null
+++ b/__std/misc/src/bin/option_test.rs
@@ -0,0 +1,12 @@
+use std::env;
+
+fn get_name() -> Option<String> {
+    env::var("NAME").ok()
+}
+
+fn main() {
+    match get_name() {
+        None => println!("No NAME"),
+        Some(name) => println!("Found NAME: {}", name),
+    }
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/result_test.rs b/__std/misc/src/bin/result_test.rs
new file mode 100644
index 0000000..9a42f39
--- /dev/null
+++ b/__std/misc/src/bin/result_test.rs
@@ -0,0 +1,24 @@
+enum ParseToIntError {
+    Empty,
+    Syntax(String),
+}
+
+fn parse_to_int(n: &str) -> Result<i32, ParseToIntError> {
+    if n.is_empty() {
+        return Err(ParseToIntError::Empty);
+    }
+    match n.parse::<i32>() {
+        Ok(i) => Ok(i),
+        Err(e) => Err(ParseToIntError::Syntax(format!("Error:{}", e))),
+    }
+}
+
+fn main() {
+    match parse_to_int("123") {
+        Ok(i) => println!("Parsed: {}", i),
+        Err(e) => match e {
+            ParseToIntError::Empty => println!("Empty input."),
+            ParseToIntError::Syntax(m) => println!("Error syntax: {}", m),
+        }
+    }
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/static_bind_test.rs b/__std/misc/src/bin/static_bind_test.rs
new file mode 100644
index 0000000..f2aec00
--- /dev/null
+++ b/__std/misc/src/bin/static_bind_test.rs
@@ -0,0 +1,24 @@
+trait Say {
+    fn say(&self);
+}
+
+struct Dog {}
+
+impl Say for Dog {
+    fn say(&self) {
+        println!("Wangwang!");
+    }
+}
+
+fn do_say<T>(s: T) where T: Say {
+    s.say();
+}
+
+// fn do_say2<T: Say>(s: T) {
+//     s.say();
+// }
+
+fn main() {
+    let dog = Dog {};
+    do_say(dog);
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/thread_test.rs b/__std/misc/src/bin/thread_test.rs
new file mode 100644
index 0000000..65f59ca
--- /dev/null
+++ b/__std/misc/src/bin/thread_test.rs
@@ -0,0 +1,13 @@
+use std::thread;
+
+fn main() {
+    let h1 = thread::spawn(|| {
+        println!("Thread #1");
+    });
+    let h2 = thread::spawn(|| {
+        println!("Thread #2");
+    });
+
+    h1.join().unwrap();
+    h2.join().unwrap();
+}
\ No newline at end of file
diff --git a/__std/misc/src/bin/trait_struct_test.rs b/__std/misc/src/bin/trait_struct_test.rs
new file mode 100644
index 0000000..74e285f
--- /dev/null
+++ b/__std/misc/src/bin/trait_struct_test.rs
@@ -0,0 +1,26 @@
+use std::ops::Deref;
+
+trait WithName {
+    fn get_name(&self) -> &str;
+}
+
+struct Human {
+    name: String,
+}
+
+impl Human {
+    fn new(name: String) -> Self {
+        Self { name }
+    }
+}
+
+impl WithName for Human {
+    fn get_name(&self) -> &str {
+        self.name.deref()
+    }
+}
+
+fn main() {
+    let with_name = Human::new("Hatter".into());
+    println!("With name: {}", with_name.get_name());
+}
\ No newline at end of file