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LAST BUILD ON BRANCH gh-readonly-queue/main/pr-12776-ce6f929bc8f8b1d58c34cbe65c67e2bca8a64f73
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Rewrite OpenQASM 3 exporter symbol table (#12776)

* Rewrite OpenQASM 3 exporter symbol table

This rewrites the symbol handling of the OpenQASM 3 exporter to decouple
object identities from the necessary object identifiers.  As part of
this, we use the same trick of standard-gate reparametrisation to
produce gate-definition sources for Qiskit built-ins, which fixes many
cases of bad parametrisation of gates like `rzx`.

This kind of rewrite was necessary to fix the now-bad assumption within
the OQ3 exporter that "gate identity" is always static within a circuit.
Since standard gate `Gate` instances are now only generated on demand,
there is no guarantee of stability of them.  The fix to the definition
source for these makes them independent of object identity.
User-defined gates can still use the identity, as these are still
guaranteed static.

This commit fixes almost all of the "bad parametrisation" tests in the
test suite.  There are several other changes in the test suite
necessary:

* since the uniqueness of the identifier is now independent of how the
  lookup of a Qiskit object works, there is no need to include the
  highly non-deterministic `id` in the generated symbols for user gates.
  Several tests changed to use the new, simple count-based unique names.

* the escaping and uniqueness rules now apply uniformly to all gate
  definitions, fixing several bad test cases that previously were
  testing invalid OpenQASM 3.

* the escaping rules changed slightly for naming collisions with
  keywords, making them slightly more consistent with how other renaming
  rules worked.

* Add test for bug fix for issue #7335

* Rename qiskit gates whose names are OQ3 hardware qubit identifiers

If a custom qiskit gate is given a name that is a valid identifer for a
hardware qubit in OQ3, then, before this commit, the name would not be
escaped when writing the OQ3 gate definition.

This commit fixes this by escaping the leading dollar sign as it would
be in... (continued)

235 of 252 new or added lines in 4 files covered. (93.25%)

12 existing lines in 3 files now uncovered.

65959 of 73341 relevant lines covered (89.93%)

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Relevant lines Covered
73341 RELEVANT LINES 65959 COVERED LINES
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Source Files on gh-readonly-queue/main/pr-12776-ce6f929bc8f8b1d58c34cbe65c67e2bca8a64f73

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10042022964 gh-readonly-queue/main/pr-12776-ce6f929bc8f8b1d58c34cbe65c67e2bca8a64f73 Rewrite OpenQASM 3 exporter symbol table (#12776) * Rewrite OpenQASM 3 exporter symbol table This rewrites the symbol handling of the OpenQASM 3 exporter to decouple object identities from the necessary object identifiers. As part of this, we u... push web-flow github
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