Proposed resolution:

This wording is relative to N4713.

1. Replace [fs.filesystem_error.members] p2-4, including Tables 119 through 121, with the following:

   filesystem_error(const string& what_arg, error_code ec);
   

   -2- Postconditions: code() == ec, path1().empty() == true, path2().empty() == true, and string_view(what()).find(what_arg) != string_view::npos.

   filesystem_error(const string& what_arg, const path& p1, error_code ec);
   

   -3- Postconditions: code() == ec, path1() returns a reference to the stored copy of p1, path2().empty() == true, and string_view(what()).find(what_arg) != string_view::npos.

   filesystem_error(const string& what_arg, const path& p1, const path& p2, error_code ec);
   

   -4- Postconditions: code() == ec, path1() returns a reference to the stored copy of p1, path2() returns a reference to the stored copy of p2, and string_view(what()).find(what_arg) != string_view::npos.

2. Edit [fs.filesystem_error.members] p7 as indicated:

   const char* what() const noexcept override;
   

   -7- Returns: A string containing runtime_error::what().An ntbs that incorporates the what_arg argument supplied to the constructor. The exact format is unspecified. Implementations should include the system_error::what() string and the pathnames of path1 and path2 in the native format in the returned string.