Use a function instead of a closure for the add_system_to_stage error…

… path

crates/bevy_ecs/src/schedule/mod.rs

@@ -20,6 +20,8 @@ pub use system_container::*;
 pub use system_descriptor::*;
 pub use system_set::*;
 
+use std::fmt::Debug;
+
 use crate::{
  system::{IntoSystem, System},
  world::World,
@@ -144,14 +146,19 @@ impl Schedule {
  stage_label: impl StageLabel,
  system: impl Into<SystemDescriptor>,
  ) -> &mut Self {
+ // Use a function instead of a closure to ensure that it is codegend inside bevy_ecs instead
+ // of the game. Closures inherit generic parameters from their enclosing function.
+ #[cold]
+ fn stage_not_found(stage_label: &dyn Debug) -> ! {
+ panic!(
+ "Stage '{:?}' does not exist or is not a SystemStage",
+ stage_label
+ )
+ }
+
  let stage = self
  .get_stage_mut::<SystemStage>(&stage_label)
- .unwrap_or_else(move || {
- panic!(
- "Stage '{:?}' does not exist or is not a SystemStage",
- stage_label
- )
- });
+ .unwrap_or_else(move || stage_not_found(&stage_label));
  stage.add_system(system);
  self
  }