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From: Philipp Stephani
Newsgroups: gmane.emacs.devel
Subject: [PATCH] * etc/NEWS: Document incompatibilities introduced by record
types.
Date: Mon, 11 Dec 2017 22:37:29 +0100
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---
etc/NEWS | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/etc/NEWS b/etc/NEWS
index 64b53d88c8..7cedd28ed9 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1462,6 +1462,20 @@ them through 'format' first. Even that is discouraged: for ElDoc
support, you should set 'eldoc-documentation-function' instead of
calling 'eldoc-message' directly.
+** The introduction of record types (see below) brings several
+incompatibilities:
+
+*** The return value of 'type-of' is no longer a reliable indicator
+for the type of an object. For example, a return value of 'integer'
+now means that the object in question is either an integer or a record
+named 'integer'. To reliably test the type of an object, use the
+predicate functions such as 'integerp'. Don't define record types
+whose names clash with primitive type names.
+
+*** The printed representation of a record named 'hash-table' now
+clashes with the printed representation of a hash table. Don't define
+record types named 'hash-table'.
+
* Lisp Changes in Emacs 26.1
--
2.15.1