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"std" import [ 1 2 + ] eval [ 3 ] = assert [ 1 2 3 ] [ clone * ] map [ 1 4 9 ] = assert 1 [ 2 3 7 ] [ * ] fold 42 = assert 42 wrap [ 42 ] = assert [ 1 2 ] unwrap + 3 = assert [ 2 ] 1 prepend [ 1 2 ] = assert