./validate fails on Mac OS

Summary

Running ./validate as per the HACKING.md guide fails due to extraneous output from cabal new-exec. It emits "Resolving dependencies..." when attempting to compute hadrian_cmd.

Steps to reproduce

./validate

Expected behavior

Computing hadrian_cmd should succeed.

Environment

GHC version used: 8.8.4

Optional:

Operating System: macOS Catalina
System Architecture: Intel Core i9

Edited Oct 26, 2020 by Will Bradley

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