--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr16302.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,76 @@
+/* PR 16302 */
+/* { dg-do compile } */
+/* { dg-options "-Wlogical-op" } */
+void bar (int);
+int
+foo (int argc, char *argv[])
+{
+  if (argc != 1 || argc != 2) return 1; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  if (argc < 0 && argc > 10) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  if (argc || !argc) return 1; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  if (argc && !argc) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (argc != 1 || argc != 2); /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  bar (argc < 0 && argc > 10); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (argc || !argc); /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  bar (argc && !argc); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (argc != 1 || argc != 2) ? 1 : 0 ; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  return (argc < 0 && argc > 10) ? 1 : 0; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (argc || !argc) ? 1 : 0; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  return (argc && !argc) ? 1 : 0; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+
+  if (argc == 2 && argc == 1) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  if (argc < 0 && argc > 10) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  if (argc || !argc) return 1; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  if (argc && !argc) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (argc == 2 && argc == 1); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (argc < 0 && argc > 10); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (argc || !argc); /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  bar (argc && !argc); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (argc == 2 && argc == 1) ? 1 : 0 ; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (argc < 0 && argc > 10) ? 1 : 0; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (argc || !argc) ? 1 : 0; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  return (argc && !argc) ? 1 : 0; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+
+  if (argc == 2 && argc == 1) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  if (argc < 0 && argc > 10) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  if (!argc || argc) return 1; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  if (!argc && argc) return 1; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (argc == 2 && argc == 1); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (argc < 0 && argc > 10); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  bar (!argc || argc); /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  bar (!argc && argc); /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (argc == 2 && argc == 1) ? 1 : 0 ; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (argc < 0 && argc > 10) ? 1 : 0; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+  return (!argc || argc) ? 1 : 0; /* { dg-warning "'or' of collectively exhaustive tests is always true" } */
+  return (!argc && argc) ? 1 : 0; /* { dg-warning "'and' of mutually exclusive tests is always false" } */
+
+  return 0;
+}
+
+int
+foo2 (int argc)
+{
+  if (5 != 1 || 5 != 2) return 1;
+  if (5 < 0 && 5 > 10) return 1;
+  if (1 || 0) return 1;
+  if (0 && 1) return 1;
+  if (2 || !2) return 1;
+  if (2 && !2) return 1;
+  if (!(!2) || !(2)) return 1;
+  if (!(!2) && !(2)) return 1;
+  bar (5 != 1 || 5 != 2);
+  bar (5 < 0 && 5 > 10);
+  bar (1 || 0);
+  bar (0 && 1);
+  bar (2 || !2);
+  bar (2 && !2);
+  return (5 != 1 || 5 != 2) ? 1 : 0 ;
+  return (5 < 0 && 5 > 10) ? 1 : 0;
+  return (1 || 0) ? 1 : 0 ;
+  return (0 && 1) ? 1 : 0;
+  return (2 || !2) ? 1 : 0;
+  return (2 && !2) ? 1 : 0;
+
+  return 0;
+}
+