[MLton] redundant code?

[Baojian Hua]

hi,

The code at line 46 of "mlton/core-ml/dead-code.fun" seems
to be redundant. The only use of the function "decIsNeeded"
is at line 69:

if decIsWild dec orelse decIsNeeded dec

where it is preceeded by a call to "decIsWild".

Am I missing something?

-Paul