(Bloomberg) -- The Puerto Rico legislature’s move to keep the commonwealth’s teacher pension from running out of cash by freezing benefits and raising worker contributions shows how U.S. municipalities are addressing a $1 trillion retirement- funding deficit by reining in once-ironclad promises.

The measure covering about 80,000 current and retired teachers goes to Governor Alejandro Garcia Padilla. With the pension projected to run out of money by 2020, the 42-year-old chief executive had pushed for the legislation and is expected to sign it after Moody’s Investors Service said Dec. 11 it may cut the commonwealth’s general-obligation debt to junk if the island, with $70 billion in general-obligation and public-agency debt, continues to deteriorate.

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