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+`impl_trait!`
+============
+
+TL;DR: this adds `impl_trait!` which lets you do:
+
+```rust
+struct Foo;
+
+trait Bar {}
+
+impl_trait! {
+  /// Yes, you can write docs here.
+  impl Foo {
+    /// You can write docs here too.
+    fn as_dyn_bar(&self) -> &dyn Bar {
+      self
+    }
+    /// You can even write docs here!
+    impl trait Bar {
+    }
+  }
+}
+```
+
+A note on licensing
+-------------------
+
+This is a proc macro. It basically implements a simple syntax sugar that you
+can trivially desugar by hand.
+
+In fact, it's probably easier to desugar by hand than to write a dang proc
+macro to do it for you!
+
+Nevertheless, yes, this is AGPLv3-licensed. If using an AGPLv3-licensed
+proc macro/compiler plugin that doesn't even add its own code to your code
+is a problem for you, you are welcome to contact us about highly expensive
+commercial licenses. However, we would find it much more satisfying if you
+told your employer to ride a cactus, because *this is a fucking compiler
+plugin omg you do not need to care about the license unless you're literally
+Godbolt Compiler Explorer or something*.
+
+Thankfully, the AGPLv3 comes with plenty of holes like the system library
+exception, as well as the fact that clause 13 specifically starts with the
+words "if you modify the Program" i.e. it explicitly doesn't apply if you're
+just using the plain old crates.io version of this crate.
+
+Further, this code is awful, so please don't copy it.
+
+License
+-------
+
+```text
+impl_trait - Rust proc macro that significantly reduces boilerplate
+Copyright (C) 2021  Soni L.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+```