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-A derive macro that generates trait impls.
-
-- [`heapsize/src/lib.rs`](heapsize/src/lib.rs)
-- [`heapsize_derive/src/lib.rs`](heapsize_derive/src/lib.rs)
-- [`example/src/main.rs`](example/src/main.rs)
-
-We are deriving the `HeapSize` trait which computes an estimate of the amount of
-heap memory owned by a value.
-
-```rust
-pub trait HeapSize {
-    /// Total number of bytes of heap memory owned by `self`.
-    fn heap_size_of_children(&self) -> usize;
-}
-```
-
-The derive macro allows users to write `#[derive(HeapSize)]` on data structures
-in their program.
-
-```rust
-#[derive(HeapSize)]
-struct Demo<'a, T: ?Sized> {
-    a: Box<T>,
-    b: u8,
-    c: &'a str,
-    d: String,
-}
-```
-
-The trait impl generated by the derive macro here would look like:
-
-```rust
-impl<'a, T: ?Sized + heapsize::HeapSize> heapsize::HeapSize for Demo<'a, T> {
-    fn heap_size_of_children(&self) -> usize {
-        0 + heapsize::HeapSize::heap_size_of_children(&self.a)
-            + heapsize::HeapSize::heap_size_of_children(&self.b)
-            + heapsize::HeapSize::heap_size_of_children(&self.c)
-            + heapsize::HeapSize::heap_size_of_children(&self.d)
-    }
-}
-```
-
-The implementation of `heapsize_derive` demonstrates some attention to "spans"
-of error messages. For each subexpression in the generated code we apply the
-span of the input fragment under which we would want to trigger a compiler error
-if the subexpression fails to compile. In this example, each recursive call to
-`heap_size_of_children` is associated with the span of the corresponding struct
-field. Thus we get errors in the right place if any of the field types do not
-implement the `HeapSize` trait.
-
-```
-error[E0277]: the trait bound `std::thread::Thread: HeapSize` is not satisfied
- --> src/main.rs:7:5
-  |
-7 |     bad: std::thread::Thread,
-  |     ^^^ the trait `HeapSize` is not implemented for `std::thread::Thread`
-```
-
-Some unstable APIs in the `proc-macro2` crate let us improve this further by
-joining together the span of the field name and the field type. There is no
-difference in our code &mdash; everything is as shown in this directory &mdash;
-but building the example crate with `cargo build` shows errors like the one
-above and building with `RUSTFLAGS='--cfg procmacro2_semver_exempt' cargo build`
-is able to show errors like the following.
-
-```
-error[E0277]: the trait bound `std::thread::Thread: HeapSize` is not satisfied
- --> src/main.rs:7:5
-  |
-7 |     bad: std::thread::Thread,
-  |     ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `HeapSize` is not implemented for `std::thread::Thread`
-```