Compilation error when applying std::views::transform to std::array

[Craffael]

Bugzilla Link	49511
Version	trunk
OS	Linux
CC	@craffael,@zygoloid

Extended Description

Unfortunately the following code fails to compile (using the STL of g++-10.2):

==== begin test program ====
#include
#include

std::array<int,2> points_;

auto foo() {
auto v = std::views::transform([](int p) {return p;});
return points_ | v;
}

int main() {
auto z = foo();
}
==== end test program ====

The same code compiles without problems using g++-10.2 so I think it should be valid code...

See also https://godbolt.org/z/e1ncvW

[Craffael]

Related: #46853

[ldionne]

Clang on Godbolt uses libstdc++ by default, you need to pass -stdlib=libc++: https://godbolt.org/z/PMeebseeE.

Also note that our ranges implementation is currently incomplete, so you will find missing parts. If you find something that we do implement but we have a bug in it, please report it. If we are missing something, please be patient -- we are tracking the missing parts and will eventually get to it.