Allow identifiers in measureExpression
#482
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Summary
The current syntax for measurement precludes the usage of defcals with return values, as discussed in this issue: #481
This PR extends
measureExpression
to allow for general identifiers. For example, this supports the followingDetails and comments
This is the smallest change I could think of to support this functionality. There's one wart, which is that
measure_iq q;
is ambiguous and resolves to a gate application rather than a quantum measurement.