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48c805bafd
The diagnostics for `enable_if_t` are extremely opaque: ``` error: no matching function for call to 'bind_front' note: candidate template ignored: requirement 'integral_constant<bool, false>::value' was not satisfied ``` Using requires-expressions gives us a little more context: ``` error: no matching function for call to 'bind_front' note: candidate template ignored: constraints not satisfied note: because 'is_constructible_v<decay_t<T &>, T &>' evaluated to false ``` Pull request: #68249