1201 - Missing 'in' at this location.

Description
The ForEach Function requires a specific syntax "ForEach( .X in .Y )" which has not been adhered to.
Example
Config:
ForEach( .I ) { }
c:\Test\fbuild.bff(1):(13) FASTBuild Error #1201 - ForEach() - Missing 'in' at this location. ForEach( .I ) ^ \--here
Fix:
ForEach( .I in .MyVars ) { }