[MacPorts] #73268: mas @ 3.1.0 ARM64: Build failure on macOS 15.7.2 with Xcode 26.1

[MacPorts]

#73268: mas @ 3.1.0 ARM64: Build failure on macOS 15.7.2 with Xcode 26.1
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  Reporter:  dancamper  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  mas        |
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Description changed by ryandesign:

Old description:

> Build log (enclosed) shows several warnings, then failure with an unknown
> Swift type:
>
> error: cannot find type 'Span' in scope
>
> Cloning the code from source repo and performing a manual build succeeds
> on the target system. In addition, this MacPorts-based mas build succeeds
> on a different laptop (macOS 26.1 with Xcode 26.1.1).

New description:

 Build log (enclosed) shows several warnings, then failure with an unknown
 Swift type:

 {{{
 error: cannot find type 'Span' in scope
 }}}

 Cloning the code from source repo and performing a manual build succeeds
 on the target system. In addition, this MacPorts-based mas build succeeds
 on a different laptop (macOS 26.1 with Xcode 26.1.1).

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Ticket URL: <https://trac.macports.org/ticket/73268#comment:9>
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