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fb6deeb984
Rather than sprinkle calls to DiagnoseUnusedExprResult() around in places where we want diagnostics, we now diagnose unused expression statements and full expressions in a more generic way when acting on the final expression statement. This results in more appropriate diagnostics for [[nodiscard]] where we were previously lacking them, such as when the body of a for loop is not a compound statement. This patch fixes PR39837. llvm-svn: 350404
93 lines
2.1 KiB
C++
93 lines
2.1 KiB
C++
// RUN: %clang_cc1 -std=c++1z -Wno-unused-value -verify %s
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// RUN: %clang_cc1 -std=c++17 -Wno-unused-value -verify %s
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void testIf() {
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int x = 0;
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if (x; x) ++x;
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if (int t = 0; t) ++t; else --t;
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if (int x, y = 0; y) // expected-note 2 {{previous definition is here}}
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int x = 0; // expected-error {{redefinition of 'x'}}
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else
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int x = 0; // expected-error {{redefinition of 'x'}}
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if (x; int a = 0) ++a;
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if (x, +x; int a = 0) // expected-note 2 {{previous definition is here}}
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int a = 0; // expected-error {{redefinition of 'a'}}
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else
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int a = 0; // expected-error {{redefinition of 'a'}}
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if (int b = 0; b)
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;
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b = 2; // expected-error {{use of undeclared identifier}}
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}
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void testSwitch() {
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int x = 0;
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switch (x; x) {
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case 1:
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++x;
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}
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switch (int x, y = 0; y) {
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case 1:
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++x;
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default:
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++y;
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}
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switch (int x, y = 0; y) { // expected-note 2 {{previous definition is here}}
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case 0:
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int x = 0; // expected-error {{redefinition of 'x'}}
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case 1:
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int y = 0; // expected-error {{redefinition of 'y'}}
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};
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switch (x; int a = 0) {
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case 0:
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++a;
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}
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switch (x, +x; int a = 0) { // expected-note {{previous definition is here}}
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case 0:
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int a = 0; // expected-error {{redefinition of 'a'}} // expected-note {{previous definition is here}}
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case 1:
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int a = 0; // expected-error {{redefinition of 'a'}}
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}
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switch (int b = 0; b) {
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case 0:
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break;
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}
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b = 2; // expected-error {{use of undeclared identifier}}
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}
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constexpr bool constexpr_if_init(int n) {
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if (int a = n; ++a > 0)
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return true;
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else
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return false;
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}
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constexpr int constexpr_switch_init(int n) {
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switch (int p = n + 2; p) {
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case 0:
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return 0;
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case 1:
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return 1;
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default:
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return -1;
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}
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}
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void test_constexpr_init_stmt() {
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constexpr bool a = constexpr_if_init(-2);
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static_assert(!a, "");
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static_assert(constexpr_if_init(1), "");
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constexpr int b = constexpr_switch_init(-1);
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static_assert(b == 1, "");
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static_assert(constexpr_switch_init(-2) == 0, "");
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static_assert(constexpr_switch_init(-5) == -1, "");
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}
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