added failing test for issue:106136

tests/incremental/auxiliary/issue-106136-macro-def.rs

@@ -0,0 +1,69 @@
+// force-host
+// no-prefer-dynamic
+// edition:2021
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+const TEMPLATE : &str = "
+type F<'a> = fn(&'a ());
+
+struct S<'a> {
+    r: &'a VARIABLE,
+    o: Box<F<'a>>,
+}
+
+struct SAsyncSendTryBuilder<
+    'a,
+    RBuilder_: for<'this> FnOnce(
+        &'this Box<F<'a>>,
+    ) -> Pin<
+        Box<dyn Future<Output = Result<&'this VARIABLE, Error_>> + Send + 'this>,
+    >,
+    Error_,
+> {
+    o: Box<F<'a>>,
+    r_builder: RBuilder_,
+}
+impl<'a, RBuilder_: for<'this> FnOnce(
+            &'this Box<F<'a>>,
+        ) -> Pin<
+            Box<dyn Future<Output = Result<&'this VARIABLE, Error_>> + Send + 'this>,
+        >,
+        Error_,
+    > SAsyncSendTryBuilder<'a, RBuilder_, Error_>
+{
+    async fn try_build_or_recover(self) -> Result<S<'a>, (Error_, Heads<'a>)> {
+        S::try_new_or_recover_async_send(self.o, self.r_builder).await
+    }
+}
+struct Heads<'a> {
+    o: Box<F<'a>>,
+    _consume_template_lifetime_a: PhantomData<&'a ()>,
+}
+impl<'a> S<'a> {
+    async fn try_new_or_recover_async_send<Error_>(
+        o: Box<F<'a>>,
+        r_builder: impl for<'this> FnOnce(
+            &'this Box<F<'a>>,
+        ) -> Pin<
+            Box<dyn Future<Output = Result<&'this VARIABLE, Error_>> + Send + 'this>,
+        >,
+    ) -> Result<S<'a>, (Error_, Heads<'a>)> {
+        todo!()
+    }
+}";
+
+#[proc_macro_derive(IncrementalMacro)]
+pub fn derive(input: TokenStream) -> TokenStream {
+    #[cfg(cfail1)] let template_type = "u8";
+    #[cfg(cfail2)] let template_type = "str";
+
+    TEMPLATE
+        .replace("VARIABLE", template_type)
+        .parse()
+        .unwrap()
+}

tests/incremental/issue-106136.rs

@@ -0,0 +1,16 @@
+// aux-build:issue-106136-macro-def.rs
+// revisions: cfail1 cfail2
+// build-pass
+// edition:2021
+
+#![crate_type = "rlib"]
+
+#[macro_use]
+extern crate issue_106136_macro_def;
+
+use core::pin::Pin;
+use core::future::Future;
+use core::marker::PhantomData;
+
+#[derive(IncrementalMacro)]
+pub struct Foo {}