Fix formatting of ranges with lvalue-qualified, non-const begin() and end() #3800
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C++20 allows ranges to have lvalue-qualified begin() and end() member functions. fmt correctly handles this if begin() and end() are additionally const-qualifed (i.e. begin() const&), but not in the non-const case. For example: https://godbolt.org/z/YfxaYz5r7 This patch fixes fmt's range detection to handle this case by testing calls to detail::ranges_begin()/end() with an lvalue T&, matching the behaviour in the const case.
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C++20 allows ranges to have lvalue-qualified begin() and end() member functions. fmt correctly handles this if begin() and end() are additionally const-qualifed (i.e. begin() const&), but not in the non-const case. For example:
https://godbolt.org/z/YfxaYz5r7
This patch fixes fmt's range detection to handle this case by testing calls to detail::ranges_begin()/end() with an lvalue T&, matching the behaviour in the const case.