Unsatisfiable requirements when trying to release new version of QuantumControl package

Tooling Package Management
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By giving the package manager some more information you can sometimes get better error messages. Here are the known hard requirements:

  • QuantumControl@0.0.4 (what the PR tries to install)
  • GRAPE@0.0.2 (required by QuantumControl@0.0.4)
  • QuantumControlBase@0.1 (required by QuantumControl@0.0.4)

If we feed this to Pkg:

$ pkg add GRAPE@0.0.2 QuantumControl@0.0.4 QuantumControlBase@0.1
   Resolving package versions...
ResolverError: Unsatisfiable requirements detected for package QuantumControlBase [f10a33bc]:
 QuantumControlBase [f10a33bc] log:
 ├─possible versions are: 0.0.1-0.1.0 or uninstalled
 ├─restricted to versions 0.1 by an explicit requirement, leaving only versions 0.1.0
 └─restricted by compatibility requirements with GRAPE [6b52fcaf] to versions: 0.0.1-0.0.3 — no versions left
   └─GRAPE [6b52fcaf] log:
     ├─possible versions are: 0.0.1-0.0.2 or uninstalled
     └─restricted to versions 0.0.2 by an explicit requirement, leaving only versions 0.0.2

we get a better error. Here we see that GRAPE@0.0.2 requires QuantumControlBase@0.0.1-0.0.3, but that’s an unsatisfiable requirement – we already required QuantumControlBase@0.1 as a hard requirement from the start!

The solution (at least a first step) is to release a version of GRAPE that supports QuantumControlBase@0.1.

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