Question: interface('longdelim' = false): doesn't work for `use` statement?

The help page of interface('longdelim') states: 

If true, Maple control structures such as if, do, proc, and so on are displayed with the newer-style long ending delimiters such as end if, end do, end proc, and so on. If false, ending delimiters are displayed as fi, od, end, and so on

If I set interface('longdelim' = false):, the Maple Input

try f:=0 catch:end try;

can be converted into 

via Context Panel>Convert To>2-D Math Input, but why is

use f=0 in f+1 end use;

still converted into

 instead of “use f = 0 in f + 1 end”? 

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