Build Failure on ports-10.10_x86_64: carthage, rust, topgrade

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.10_x86_64
Full logs:    https://build.macports.org/builders/ports-10.10_x86_64-watcher/builds/37730
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    topgrade
Subport list:
	- topgrade
Variants:     None
Revision:     214eb7071f582cbdff2f24198db11605b3e2724b
Build time:   0:02:53
Author:       Lothar Haeger <lhaeger at users.noreply.github.com>

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-10.10_x86_64-builder #123146
  https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/123146

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