https://bugs.llvm.org/show_bug.cgi?id=47386
Bug ID: 47386
Summary: ICE when not unpacking variadic template into concept
Product: clang
Version: 10.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: matt+l...@offtopica.uk
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
Compiling this causes an ICE:
template <typename... Ts>
concept Foo = true;
template <typename... Ts> requires Foo<Ts /* ... */>
class Bar {};
Bar<int> bar;
GCC 10.2.0 fails gracefully with an error, stating that the parameter pack
isn't expanded.
$ g++ -std=c++2a -c foo.cc
foo.cc:4:36: error: parameter packs not expanded with '...':
4 | template <typename... Ts> requires Foo<Ts /* ... */>
| ^~~~~~~~~~~~~~~~~
foo.cc:4:36: note: 'Ts'
foo.cc:7:8: error: template constraint failure for 'template<class ... Ts>
requires <erroneous-expression> class Bar'
7 | Bar<int> bar;
| ^
foo.cc:7:8: note: constraints not satisfied
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