https://github.com/rust-lang/rust/pull/104134

Author: YoungHaKim7

rust1_75/README.md

@@ -6,6 +6,24 @@
   - https://blog.rust-lang.org/2023/12/11/cargo-cache-cleaning.html
   - https://rust-lang.github.io/rfcs/3425-return-position-impl-trait-in-traits.html
 
+- https://github.com/rust-lang/rust/pull/104134
+
+```rs
+
+#![allow(unreachable_code)]
+ 
+async fn f(_: u8) {}
+ 
+async fn g() {
+    f(todo!("...")).await;
+}
+ 
+fn require_send(_: impl Send) {}
+ 
+fn main() {
+    require_send(g());
+}
+```
 
 
 # Rust Clippy

rust1_75/f01_async_fn_closure/.gitignore

@@ -0,0 +1,30 @@
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+
+# A collection of useful .gitignore templates 
+# https://github.com/github/gitignore\xa
+# General
+.DS_Store
+dir/otherdir/.DS_Store
+
+# VS Code files for those working on multiple tools
+.vscode/
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# WASM
+pkg/
+/wasm-pack.log
+dist/

rust1_75/f01_async_fn_closure/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "f01_async_fn_closure"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tokio = { version = "1.37.0", features = ["full"] }

rust1_75/f01_async_fn_closure/README.md

@@ -0,0 +1,7 @@
+# Result
+
+```bash
+
+async 8
+```
+

rust1_75/f01_async_fn_closure/src/main.rs

@@ -0,0 +1,14 @@
+async fn f(number: u8) {
+    println!("async {number}");
+}
+
+async fn g() {
+    f(8).await;
+}
+
+fn require_send(_: impl Send) {}
+
+#[tokio::main]
+async fn main() {
+    require_send(g().await);
+}