https://bugs.llvm.org/show_bug.cgi?id=50496
Bug ID: 50496
Summary: Use of auto template parameters breaks partial
specialization
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++17
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
The following code fails to compile, but should:
inline constexpr struct S {} C {};
template <class S>
struct traits;
template <auto& A>
struct odd {};
template <auto& A>
struct traits<odd<A>> {};
int main() {
traits<odd<C>> t; // ERROR HERE
}
The commented line in main generated the following error:
error: implicit instantiation of undefined template 'traits<odd<C>>'
traits<odd<C>> t;
^
The partial specialization with the auto template parameter fails to match the
instantiation.
GCC accepts the code. A slight tweak causes clang to accept the code (replacing
`auto&` with `const auto&`.
https://godbolt.org/z/M7Y9nvva3
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