From ac0579c81f9e8f10321c77432c9ae759e406c371 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Tj=C3=A4der?= <henrik@tjaders.com>
Date: Sun, 8 Jun 2025 12:17:58 +0200
Subject: UI: Test for references passed to spawn

Related to and using code from Issue1065

Issue1065: https://github.com/rtic-rs/rtic/issues/1065
---
 rtic/ui/task-reference-in-spawn.rs     | 29 +++++++++++++++++++++++++++++
 rtic/ui/task-reference-in-spawn.stderr | 14 ++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 rtic/ui/task-reference-in-spawn.rs
 create mode 100644 rtic/ui/task-reference-in-spawn.stderr

diff --git a/rtic/ui/task-reference-in-spawn.rs b/rtic/ui/task-reference-in-spawn.rs
new file mode 100644
index 0000000..54607af
--- /dev/null
+++ b/rtic/ui/task-reference-in-spawn.rs
@@ -0,0 +1,29 @@
+#![no_main]
+
+#[rtic::app(device = lm3s6965, dispatchers = [SSI0, QEI0, GPIOA])]
+mod app {
+    #[shared]
+    struct Shared {}
+
+    #[local]
+    struct Local {}
+
+    #[init]
+    fn init(_: init::Context) -> (Shared, Local) {
+        medium_prio::spawn().unwrap();
+        (Shared {}, Local {})
+    }
+
+    #[task(priority = 2)]
+    async fn medium_prio(_: medium_prio::Context) {
+        let mut will_be_dropped: usize = 41;
+        will_be_dropped += 1;
+
+        high_prio_print::spawn(&mut will_be_dropped).unwrap();
+    }
+
+    #[task(priority = 3)]
+    async fn high_prio_print(_: high_prio_print::Context, mut_ref: &mut usize) {
+        *mut_ref += 1000;
+    }
+}
diff --git a/rtic/ui/task-reference-in-spawn.stderr b/rtic/ui/task-reference-in-spawn.stderr
new file mode 100644
index 0000000..38de78c
--- /dev/null
+++ b/rtic/ui/task-reference-in-spawn.stderr
@@ -0,0 +1,14 @@
+error[E0521]: borrowed data escapes outside of function
+  --> ui/task-reference-in-spawn.rs:3:1
+   |
+3  | #[rtic::app(device = lm3s6965, dispatchers = [SSI0, QEI0, GPIOA])]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | |
+   | `_0` is a reference that is only valid in the function body
+   | `_0` escapes the function body here
+   | argument requires that `'1` must outlive `'static`
+...
+26 |     async fn high_prio_print(_: high_prio_print::Context, mut_ref: &mut usize) {
+   |                                                                    - let's call the lifetime of this reference `'1`
+   |
+   = note: this error originates in the attribute macro `rtic::app` (in Nightly builds, run with -Z macro-backtrace for more info)
-- 
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