Build Failure on ports-10.7_x86_64: carthage, rust, topgrade

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.7_x86_64
Full logs:    https://build.macports.org/builders/ports-10.7_x86_64-watcher/builds/9450
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    topgrade
Subport list:
	- topgrade
Variants:     None
Revision:     65b570291839c8373ddc3b4a4d5682fe105b26e0
Build time:   0:03:10
Author:       Lothar Haeger <lothar.haeger at gmx.net>

Log from failed builds:
	Building 'topgrade' ... [ERROR] (failed to install dependency 'rust')
	> maintainers: lothar.haeger at gmx.net,g5pw at macports.org,herby.gillot at gmail.com.
	Building 'topgrade' ... [ERROR] (failed to install dependency 'carthage')
	> maintainers: lothar.haeger at gmx.net,saagar at saagarjha.com.

Broken ports:
	- carthage
	- rust
	- topgrade

Responsible maintainers:
	- g5pw at macports.org
	- herby.gillot at gmail.com
	- lothar.haeger at gmx.net
	- saagar at saagarjha.com

Links to individual build jobs:
- ports-10.7_x86_64-builder #29146
  https://build.macports.org/builders/ports-10.7_x86_64-builder/builds/29146

-- 
Best regards,
MacPorts Buildbot
https://build.macports.org/