Improve exceptions for SSA checks with improper reuse #625
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Description & Motivation
There was a version of illegal SSA signal reuse that, instead of providing a useful error message, would give a confusing error about some "phi" signal already connected. This PR introduces a check and better exception in those cases to aid in debug.
Related Issue(s)
N/A
Testing
Added new test to ensure the exception is triggered appropriately.
Backwards-compatibility
No
Documentation
No