https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103929
Bug ID: 103929
Summary: False warning: no return statement in function
returning non-void
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
In the following program:
```
template<auto>
struct A{};
template<class = A<[]{}>>
struct B { using X = B<>; };
B<int> x;
```
compiled with `-std=c++20 -Wall -Wextra -pedantic-errors` flags, GCC prints
false warning:
```
warning: no return statement in function returning non-void [-Wreturn-type]
4 | template<class = A<[]{}>>
| ^~~~
```
Demo: https://gcc.godbolt.org/z/bjrs5vMhj
But actually `[]{}` is a lambda returning void, so no return statement is
necessary.
