From 053f721836d3e88dbefb0fbe478300224707797b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89amonn=20McManus?= <emcmanus@google.com>
Date: Fri, 19 Jul 2024 15:11:51 -0700
Subject: [PATCH] Add `TraditionalSwitchExpression.md`.

PiperOrigin-RevId: 654138846
---
 docs/bugpattern/TraditionalSwitchExpression.md | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 docs/bugpattern/TraditionalSwitchExpression.md

diff --git a/docs/bugpattern/TraditionalSwitchExpression.md b/docs/bugpattern/TraditionalSwitchExpression.md
new file mode 100644
index 00000000000..696272f3ba0
--- /dev/null
+++ b/docs/bugpattern/TraditionalSwitchExpression.md
@@ -0,0 +1,6 @@
+The newer arrow (`->`) syntax for switches is preferred to the older colon (`:`)
+syntax. The main reason for continuing to use the colon syntax in switch
+*statements* is that it allows fall-through from one statement group to the
+next. But in a switch *expression*, fall-through would only be useful if the
+code that falls through has side effects. Burying side effects inside a switch
+expression makes code hard to understand.