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As statement expression makes no sense in the default argument, this patch tries to disable it in the all cases. Please note that the statement expression is a GNU extension, which means that Clang should be consistent with GCC. However, there's no response from GCC devs since we have raised the issue for several weeks. In this case, I think we can disallow statement expressions as a default parameter in general for now, and relax the restriction if GCC folks decide to retain the feature for functions but not lambdas in the future. Related discussion: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104765 Fixes https://github.com/llvm/llvm-project/issues/53488 Differential Revision: https://reviews.llvm.org/D119609
30 lines
1.2 KiB
C++
30 lines
1.2 KiB
C++
// RUN: %clang_cc1 %s -fsyntax-only -verify -std=c++20
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void foo() {
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void fn(int i, int = ({ 1; })); // expected-error {{default argument may not use a GNU statement expression}}
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auto a = [](int = ({ 1; })) {}; // expected-error {{default argument may not use a GNU statement expression}}
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auto b = []<int = ({ 1; })>(){}; // expected-error {{default non-type template argument may not use a GNU statement expression}}
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void fn(int i, int j = ({{}, {}, {,}}), int k = ""); // expected-error {{default argument may not use a GNU statement expression}} expected-error {{cannot initialize a parameter of type 'int' with an lvalue of type 'const char[1]'}} expected-note {{passing argument to parameter 'k' here}}
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}
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template <int foo = ({ 1; })> // expected-error {{default non-type template argument may not use a GNU statement expression}}
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void f() {}
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template <int bar = ({ 1; })> // expected-error {{default non-type template argument may not use a GNU statement expression}}
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class S {};
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template <typename Callable>
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int bar(Callable &&Call) {
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return Call();
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}
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int baz() {
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auto l = [](int a = ({ int x = 12; x; })) { // expected-error {{default argument may not use a GNU statement expression}}
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return 1;
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};
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return bar(l);
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}
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