[MacPorts] #59791: mame @0.203: no type named string_view

[MacPorts]

#59791: mame @0.203: no type named string_view
--------------------+--------------------
 Reporter:  Tatsh   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.2
 Keywords:          |       Port:
--------------------+--------------------
 It fails when building anything using the included asio library under
 3rdparty.

 {{{
 :info:build
 ../../../../../3rdparty/asio/include/asio/ip/impl/address.ipp:139:22:
 error: unknown type name 's
 tring_view'; did you mean 'std::string_view'?
 :info:build address make_address(string_view str)
 :info:build                      ^~~~~~~~~~~
 :info:build                      std::string_view
 :info:build In file included from ../../../../../src/emu/http.cpp:1:
 :info:build In file included from ../../../../../src/emu/emu.h:29:
 }}}

 I'm on Catalina with Xcode 11 which may be causing this.

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Ticket URL: <https://trac.macports.org/ticket/59791>
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