Build Failure on ports-10.6_x86_64: topgrade

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_x86_64
Full logs:    https://build.macports.org/builders/ports-10.6_x86_64-watcher/builds/7293
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    topgrade
Subport list:
	- topgrade
Variants:     None
Revision:     5a17d86e21c9197d364b329f5c08402c1fdfe319
Build time:   0:04:56
Author:       Lothar Haeger <lhaeger at users.noreply.github.com>

Log from failed builds:
	Building 'topgrade' ... [ERROR] (failed to fetch dependency 'rust')
	> maintainers: lothar.haeger at gmx.net,g5pw at macports.org.

Broken ports:
	- topgrade

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

Links to individual build jobs:
- ports-10.6_x86_64-builder #28004
  https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/28004

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MacPorts Buildbot
https://build.macports.org/