Import inventory-impl macros into inventory crate

Cargo.toml

@@ -13,14 +13,10 @@ rust-version = "1.31"
 [dependencies]
 ctor = "0.1"
 ghost = "0.1.1"
-inventory-impl = { version = "=0.1.11", path = "impl" }
 
 [dev-dependencies]
 rustversion = "1.0"
 trybuild = "1.0"
 
-[workspace]
-members = ["impl"]
-
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]

src/lib.rs

@@ -119,10 +119,6 @@ extern crate alloc;
 #[doc(hidden)]
 pub use ctor::ctor;
 
-// Not public API.
-#[doc(hidden)]
-pub use inventory_impl as r#impl;
-
 use alloc::boxed::Box;
 use core::ops::Deref;
 use core::ptr;
@@ -374,9 +370,33 @@ macro_rules! collect {
 #[macro_export]
 macro_rules! submit {
     ($($value:tt)*) => {
-        $crate::r#impl::submit! {
-            $($value)*
-        }
+        const _: () = {
+            #[allow(non_upper_case_globals)]
+            #[$crate::ctor]
+            fn __init() {
+                // TODO: once existential type is stable, store the caller's
+                // expression into a static and string those statics together
+                // into an intrusive linked list without needing allocation.
+                //
+                //     existential type This;
+                //
+                //     static mut VALUE: Option<inventory::Node<This>> = None;
+                //
+                //     fn value() -> This {
+                //         $($value)*
+                //     }
+                //
+                //     unsafe {
+                //         VALUE = Some(inventory::Node {
+                //             value: value(),
+                //             next: None,
+                //         });
+                //         inventory::submit(VALUE.as_mut().unwrap());
+                //     }
+
+                $crate::submit({ $($value)* });
+            }
+        };
     }
 }
 

tests/ui/submit-unrecognized.stderr

@@ -9,4 +9,4 @@ note: required by a bound in `submit`
     |
     | pub fn submit<T: Collect>(value: T) {
     |                  ^^^^^^^ required by this bound in `submit`
-    = note: this error originates in the macro `$crate::impl::submit` (in Nightly builds, run with -Z macro-backtrace for more info)
+    = note: this error originates in the macro `inventory::submit` (in Nightly builds, run with -Z macro-backtrace for more info)