https://bugs.llvm.org/show_bug.cgi?id=52434
Bug ID: 52434
Summary: A conversion function template shall not have a
deduced return type
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: fchelno...@gmail.com
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
This code is invalid:
```
struct S {
template<class=void>
operator auto() const { return 2; }
};
int main() {
S s;
[[maybe_unused]] int d = s;
}
```
because the standard explicitly prohibits conversion function template having a
deduced return type:
https://timsong-cpp.github.io/cppwp/n4861/class.conv.fct#6
But now Clang accepts the program:
https://gcc.godbolt.org/z/rMK4zboEd
which is a bug.
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