1 // RUN: %clang_cc1 -std=c++1z -Wno-unused-value -verify %s
2 // RUN: %clang_cc1 -std=c++17 -Wno-unused-value -verify %s
3
testIf()4 void testIf() {
5 int x = 0;
6 if (x; x) ++x;
7 if (int t = 0; t) ++t; else --t;
8
9 if (int x, y = 0; y) // expected-note 2 {{previous definition is here}}
10 int x = 0; // expected-error {{redefinition of 'x'}}
11 else
12 int x = 0; // expected-error {{redefinition of 'x'}}
13
14 if (x; int a = 0) ++a;
15 if (x, +x; int a = 0) // expected-note 2 {{previous definition is here}}
16 int a = 0; // expected-error {{redefinition of 'a'}}
17 else
18 int a = 0; // expected-error {{redefinition of 'a'}}
19
20 if (int b = 0; b)
21 ;
22 b = 2; // expected-error {{use of undeclared identifier}}
23 }
24
testSwitch()25 void testSwitch() {
26 int x = 0;
27 switch (x; x) {
28 case 1:
29 ++x;
30 }
31
32 switch (int x, y = 0; y) {
33 case 1:
34 ++x;
35 default:
36 ++y;
37 }
38
39 switch (int x, y = 0; y) { // expected-note 2 {{previous definition is here}}
40 case 0:
41 int x = 0; // expected-error {{redefinition of 'x'}}
42 case 1:
43 int y = 0; // expected-error {{redefinition of 'y'}}
44 };
45
46 switch (x; int a = 0) {
47 case 0:
48 ++a;
49 }
50
51 switch (x, +x; int a = 0) { // expected-note {{previous definition is here}}
52 case 0:
53 int a = 0; // expected-error {{redefinition of 'a'}} // expected-note {{previous definition is here}}
54 case 1:
55 int a = 0; // expected-error {{redefinition of 'a'}}
56 }
57
58 switch (int b = 0; b) {
59 case 0:
60 break;
61 }
62 b = 2; // expected-error {{use of undeclared identifier}}
63 }
64
constexpr_if_init(int n)65 constexpr bool constexpr_if_init(int n) {
66 if (int a = n; ++a > 0)
67 return true;
68 else
69 return false;
70 }
71
constexpr_switch_init(int n)72 constexpr int constexpr_switch_init(int n) {
73 switch (int p = n + 2; p) {
74 case 0:
75 return 0;
76 case 1:
77 return 1;
78 default:
79 return -1;
80 }
81 }
82
test_constexpr_init_stmt()83 void test_constexpr_init_stmt() {
84 constexpr bool a = constexpr_if_init(-2);
85 static_assert(!a, "");
86 static_assert(constexpr_if_init(1), "");
87
88 constexpr int b = constexpr_switch_init(-1);
89 static_assert(b == 1, "");
90 static_assert(constexpr_switch_init(-2) == 0, "");
91 static_assert(constexpr_switch_init(-5) == -1, "");
92 }
93
test_lambda_init()94 int test_lambda_init() {
95 if (int x = []() {int x = 42; return x; }(); x) {
96 };
97
98 switch (int y = []() {int y = 42; return y; }(); y) {
99 case 42:
100 return 1;
101 }
102
103 for (int x = [] { int x = 0; return x; }();;)
104 ;
105
106 return 0;
107 }
108