fix compile error (Visual C++)

[MonsieurNicolas]

missing capture in a lambda (not sure why this compiles)

[anupsdf]

r+ e850caa

[bboston7]

I went down a bit of a rabbit hole (partially because I wrote this code) and the code is valid, but MSVC doesn't comply with the standard in this case, though it's admittedly a bit of a strange edge case. It makes me wonder, should we have an MSVC build in our CI system to catch these things automatically?

[MonsieurNicolas]

I went down a bit of a rabbit hole (partially because I wrote this code) and the code is valid, but MSVC doesn't comply with the standard in this case, though it's admittedly a bit of a strange edge case. It makes me wonder, should we have an MSVC build in our CI system to catch these things automatically?

the standard works in mysterious ways!