I suspect the presence of slashes gave us linker errors...

dylo-cli/src/init_template.rs

@@ -4,7 +4,7 @@ use dylo_runtime as _;
 ///
 /// See <https://github.com/bearcove/dylo>
 #[doc(hidden)]
-#[export_name = "https://github.com/bearcove/dylo"]
+#[export_name = "github.com_bearcove_dylo"]
 pub extern "Rust" fn awaken() -> &'static (dyn crate::Mod) {
     let m: crate::ModImpl = std::default::Default::default();
     let m: std::boxed::Box<dyn crate::Mod> = std::boxed::Box::new(m);

dylo-runtime/src/details.rs

@@ -325,7 +325,7 @@ pub fn load_mod(mod_name: &'static str) -> AnyModRef {
 
     // note: we never dlclose the handle, on purpose.
 
-    let symbol_name = CString::new("https://github.com/bearcove/dylo").unwrap();
+    let symbol_name = CString::new("github.com_bearcove_dylo").unwrap();
     let init_sym = unsafe { dlsym(handle, symbol_name.as_ptr()) };
     if init_sym.is_null() {
         let err = unsafe { std::ffi::CStr::from_ptr(dlerror()) }