diff --git a/README.md b/README.md
index 42c0fde..8cc1468 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,10 @@
 # Actually Portable Executables with Cosmopolitan Libc and Rust
 
 This repository contains a simple `Hello world!` example in the [Rust][rust]
-programming language, that builds with [Cosmopolitan Libc][cosmo]. 
+programming language, that builds with [Cosmopolitan Libc][cosmo]. To build it
+you need a recent version of `gcc` (9 or 10 ought to be good), a recent version
+of `binutils` (`ld.bfd` and `objcopy`), and `bash` because I wrote a simple
+filter script.
 
 I created a [custom compilation target][custom-target] for Rust, called
 `x86_64-unknown-linux-cosmo`, to provide a build process that uses the
@@ -43,6 +46,8 @@ For reference, this worked when I tried it for `nightly-x86_64-linux-gnu` and:
 * the Rust binaries on June 22 2022 (5750a6aa2 2022-06-20)
 * the Rust binaries on June 25 2022 (fdca237d5 2022-06-24)
 * the Rust binaries on June 26 2022 (20a6f3a8a 2022-06-25)
+* the Rust binaries on June 30 2022 (ddcbba036 2022-06-29)
+* the Rust binaries on July 27 2022 (4d6d601c8 2022-07-26)
 
 3. run `cargo build` to get the debug executable. This uses a bash script that
    removes unnecessary linker arguments. A recent version of `gcc` and `ld.bfd`
@@ -72,13 +77,14 @@ This program has absolutely no warranty.
 4. run `objcopy` on the debug binary to obtain the APE:
 
 ```bash
+# look at the built debug binaries
+ls ./target/x86_64-unknown-linux-cosmo/debug/*.com.dbg
 # objcopy is the same version as ld.bfd above
 objcopy -SO binary ./target/x86_64-unknown-linux-cosmo/debug/hello_world.com.dbg ./hello_world.com
 # run the APE
 ./hello_world.com
 # see syscalls made by the APE
 ./hello_world.com --strace
-# ls ./target/x86_64-unknown-linux-cosmo/debug/*.com.dbg
 ```
 
 Now we have Actually Portable Executables built with Rust! I also built a few
diff --git a/src/bin/unsafe-but-asan.rs b/src/bin/unsafe-but-asan.rs
deleted file mode 100644
index 39945fa..0000000
--- a/src/bin/unsafe-but-asan.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-#![no_main]
-#![no_std]
-#![feature(rustc_private)]
-
-extern crate libc;
-
-extern "C" {
-    fn ShowCrashReports();
-}
-
-#[no_mangle]
-pub extern "C" fn main(_argc: isize, _argv: *const *const u8) -> isize {
-    unsafe {
-        ShowCrashReports();
-        let mut buffer = libc::malloc(13);
-        const c_str: &'static str = "Hello\0";
-        libc::strcpy(buffer as *mut i8, c_str.as_ptr() as *const i8);
-        libc::free(buffer);
-        libc::printf(buffer as *const _);
-    }
-    0
-}
-
-#[panic_handler]
-fn my_panic(_info: &core::panic::PanicInfo) -> ! {
-    loop {}
-}