Build Failure on ports-10.8_x86_64: rust, topgrade

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.8_x86_64
Full logs:    https://build.macports.org/builders/ports-10.8_x86_64-watcher/builds/6089
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    topgrade
Subport list:
	- topgrade
Variants:     None
Revision:     d60e7fb988d813dbc8093c6a2dc8cca0d4b27fb7
Build time:   0:01:35
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.

Broken ports:
	- rust
	- topgrade

Responsible maintainers:
	- g5pw at macports.org
	- lothar.haeger at gmx.net

Links to individual build jobs:
- ports-10.8_x86_64-builder #21217
  https://build.macports.org/builders/ports-10.8_x86_64-builder/builds/21217

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