add :import
/:using
/:export
heads to VALID_EXPR_HEADS
#52906
Merged
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Typically, top-level thunks that include these exprs aren't compiled. However, in certain
AbstractInterpreter
s such as JET, there's a need to perform inference on arbitrary top-level thunks for analysis purposes. So this commit updates the IR validator so that it does not raise errors on these exprs.