NSIS 2.17 and NSIS 2.39

Hi All,

I upgrade from NSIS 2.17 to NSIS 2.39

I faced one problem

previously(2.17) i was using
GetFullPathName $DirPath "$APPDATA\..\Test\"

the variable $DirPath was not declared

but it did not worked in 2.39

but when i added
var DirPath

it worked.

I just want to know that in which version this checking was added

ChangeLog?