https://bugs.llvm.org/show_bug.cgi?id=49224
Bug ID: 49224
Summary: Wrong error "template template argument has different
template argument than parameters than its
corresponding template template parameter"
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++17
Assignee: unassignedclangb...@nondot.org
Reporter: gabrav...@gmail.com
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
template <class T, class U, class A = int>
struct X {};
template <template <class, class> class T>
struct Y {};
using type = Y<X>;
In C++20 mode, GCC and MSVC build this fine, while Clang complains that
"template template argument has different template argument than parameters
than its corresponding template template parameter"
I believe https://eel.is/c++draft/temp.arg.template#example-2 means this should
work. -frelaxed-template-template-args makes it work, but I don't think that
should be required.
See also Godbolt comparison here: https://godbolt.org/z/oefM73
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