https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123974
Bug ID: 123974
Summary: C++26: Reflection Expansion Statements - P1306R5:
Can't expand case label in switch.
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: c++26
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bakiev at elemer dot ru
Target Milestone: ---
This sample code is not build in the current implementation.
```cpp
#include <cassert>
constexpr int test_clang(int arg) {
switch (arg) {
template for (constexpr auto i : { 1, 2, 3, 4, 5 })
case i: return i * 10; // GCC error
default: break;
}
return arg;
}
constexpr int test_gcc(int arg) {
template for (constexpr auto i : { 1, 2, 3, 4, 5 })
if (i == arg) return i * 10;
return arg;
}
int main()
{
//static_assert(test_clang(3) == 30);
static_assert(test_gcc(3) == 30);
assert(test_clang(3) == 30);
assert(test_gcc(3) == 30);
return 0;
}
```
Dan Katz's Bloomberg/Clang_P2996 build all submitted code.
https://godbolt.org/z/v338jcbfP
Maybe these fixes will help you understand how to implement "Code Injection
with Token Sequences P3294R1" or similar proposals in the future.
