Qiskit / qiskit / 15308676432

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github

Committed by web-flow

Commit Message

Fix Sabre rebuild with nested `Var` and `Stretch` (backport #14488) (#14493)

* Fix Sabre rebuild with nested `Var` and `Stretch` (#14488)

The `empty_dag` helper, used to construct control-flow blocks, in the
rebuilder failed to account for `Var` or `Stretch` nodes.  We have
integration tests in `test/python/compiler/test_transpiler.py` that _in
theory_ should have caught this, but in practice failed to because they
are accidentally using all-to-all connectivity backends, so Sabre never
runs in them.

* Fix test if routing occurs

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Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

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