[MacPorts] #70573: rust-bootstrap @1.77.0 fails to parse on macOS 10.14

[MacPorts]

#70573: rust-bootstrap @1.77.0 fails to parse on macOS 10.14
--------------------+---------------------------------
 Reporter:  jmroot  |      Owner:  MarcusCalhoun-Lopez
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  rust-bootstrap
--------------------+---------------------------------
 {{{
 % % port -D lang/rust-bootstrap info
 }}}
 results in
 {{{
 Can't map the URL 'file://.' to a port description file
 ("rust_build.version (1.77.0) must be newer than
 rust_build.stage0_versions (1.79.0 1.78.0)").
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70573>
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