added from example

Author: BartMassey

fromcomplex/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "fromcomplex"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

fromcomplex/src/main.rs

@@ -0,0 +1,21 @@
+#[derive(Debug)]
+struct MyUnit;
+
+#[derive(Debug)]
+#[allow(dead_code)]
+enum MyOption<T> {
+    Some(T),
+    None,
+}
+
+impl From<()> for MyOption<MyUnit> {
+    fn from(_: ()) -> Self {
+        MyOption::Some(MyUnit)
+    }
+}
+
+fn main() {
+    println!("{:?}", <MyOption<MyUnit>>::from(()));
+    let o: MyOption<MyUnit> = ().into();
+    println!("{:?}", o);
+}