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+[[!meta title="Improving compiler diagnostics with Overlays"]]
+[[!meta copyright="Copyright © 2023 Jeff Trull"]]
+[[!inline pages="internal(2023/info/overlay-nav)" raw="yes"]]
+
+<!-- Initially generated with emacsconf-publish-talk-page and then left alone for manual editing -->
+<!-- You can manually edit this file to update the abstract, add links, etc. --->
+
+
+# Improving compiler diagnostics with Overlays
+Jeff Trull (he/him) - Pronunciation: rhymes with "hull" and "dull", IRC: jaafar, @jaafar@hachyderm.io
+
+[[!inline pages="internal(2023/info/overlay-before)" raw="yes"]]
+
+Overlays are a feature of Emacs that allow changing the
+appearance of text while preserving its contents. They play a prominent
+role in packages like org-mode, which uses them to hide or reveal custom
+properties and display inline images, and magit, which uses them to
+highlight diffs.
+
+The presenter will give a introduction to the features of overlays,
+demonstrating how to:
+
+-   Create and use overlays in Emacs Lisp code
+-   Query locations in an existing buffer to find out what overlays are
+present.
+
+He will then demonstrate a new compilation minor mode for improving the
+readability of error messages, using overlays to flexibly reformat portions
+of the compiler output under user control.
+
+
+
+[[!inline pages="internal(2023/info/overlay-after)" raw="yes"]]
+
+[[!inline pages="internal(2023/info/overlay-nav)" raw="yes"]]
+
+