[src/trunk]: src/tests/usr.bin/xlint/lint1 tests/lint: demonstrate undetected...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c8aa34d2bd06
branches:  trunk
changeset: 359665:c8aa34d2bd06
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Jan 15 22:12:35 2022 +0000

description:
tests/lint: demonstrate undetected double semicolon

In a statement-list like 'return 0;;', the second semicolon is a
separate, unreachable statement.

diffstat:

 tests/usr.bin/xlint/lint1/msg_193.c |  13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diffs (24 lines):

diff -r 06e4ac8418f2 -r c8aa34d2bd06 tests/usr.bin/xlint/lint1/msg_193.c
--- a/tests/usr.bin/xlint/lint1/msg_193.c       Sat Jan 15 20:16:55 2022 +0000
+++ b/tests/usr.bin/xlint/lint1/msg_193.c       Sat Jan 15 22:12:35 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: msg_193.c,v 1.14 2021/08/15 21:51:56 rillig Exp $      */
+/*     $NetBSD: msg_193.c,v 1.15 2022/01/15 22:12:35 rillig Exp $      */
 # 3 "msg_193.c"
 
 // Test for message: statement not reached [193]
@@ -656,3 +656,14 @@
                /* NOTREACHED */
                suppressed();
 }
+
+/*
+ * Since at least 2002, lint does not detect a double semicolon.  See
+ * cgram.y, expression_statement, T_SEMI.
+ */
+int
+test_empty_statement(int x)
+{
+       /* TODO: expect+1: warning: statement not reachable [193] */
+       return x > 0 ? x : -x;;
+}