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Description
[class.conv.general] p4 says
At most one user-defined conversion (constructor or conversion function) is implicitly applied to a single value.
However this does not explain anything, the actually specification leading to this restriction is described in
[over.best.ics.general]
We can leave the sentence but we should probably make it a note
Proposed resolution
Make [class.conv.general] p4 a note
[Note: At most one user-defined conversion (constructor or conversion function) is implicitly applied to a single value. — end note]