WASHINGTON — Proposed extensions to major bond provisions have survived several revisions of pending tax legislation, but municipal market participants are wondering if more controversial, non-bond provisions could scuttle the entire package.

While lawmakers in the Senate continue tweaking a tax package that would extend several expiring tax provisions, extensions to bond provisions — including the Build America Bonds program — have gone unchanged. In fact, a recent draft of a substitute amendment that circulated among lobbyists this week included all the bond provisions that were part of earlier versions of the bill, as Senate Democrats weigh scaling back other, pricier items, such as a $24 billion provision that would give states additional Medicaid funds.

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