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Mar 30, 2025
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Release notes for "Better source location tracking" #2035

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e37e463
source location tracking
SpecificProtagonist Mar 28, 2025
4ba01fb
Minor wording tweak
alice-i-cecile Mar 30, 2025
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16 changes: 13 additions & 3 deletions release-content/0.16/release-notes/16778_Event_source_location_tracking.md
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@@ -1,4 +1,14 @@
<!-- Event source location tracking -->
<!-- https://github.com/bevyengine/bevy/pull/16778 -->
<!-- Better source location tracking -->

<!-- TODO -->
Having a unified data model allows introspection and debugging tools to work for the entire engine:
For example, last release's `track_change_detection` feature flag lets you
automatically track by which line of source code any component (or resource) was inserted/mutated.

Now it also tracks which code
- triggered a hook or observer: `HookContext.caller`, `Trigger::caller()`
- sent an event: `EventId.caller`
- spawned or despawned an entity (until the entity index is reused): `EntityRef::spawned_by()`, `Entities::entity_get_spawned_or_despawned_by()`

And as a side effect, this leads to nicer error messages in some cases:
`Entity 0v1 was despawned by src/main.rs:10:11`.
Having outgrown its old name, the feature flag is now called `track_location`.
6 changes: 3 additions & 3 deletions release-content/0.16/release-notes/_release-notes.toml
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Expand Up @@ -44,9 +44,9 @@ file_name = "unified_error_handling.md"

[[release_notes]]
title = "Better location tracking"
authors = ["@SpecificProtagonist"]
contributors = ["@alice-i-cecile", "Freya Pines", "@pin3-free", "@mweatherley"]
prs = [15607, 16047, 16778]
authors = ["@SpecificProtagonist", "@chescock"]
contributors = ["@alice-i-cecile", "Freya Pines", "@pin3-free", "@mweatherley", "@skimmedsquare"]
prs = [15607, 16047, 16778, 17075, 17602]
file_name = "16778_Event_source_location_tracking.md"

[[release_notes]]
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