Function Redefinition causes compilation to fail silently

[fromanan]

This issue came up a few times for me so I thought I'd make note of it. It's not a huge deal, it can just be a little bit tricky when working with larger mods with similarly named functions. Haven't looked into the compilation process used, but it should be a fairly trivial fix to look for 2 names or checking the symbol table. (Low priority / QoL fix)

Specific example:

When defining multiple global functions with the name "LandShip" inside the same namespace of a script, the compiler will give the same message as success (press any key to continue...) without any warnings. I actually noticed it was failing because it did not produce a file and the usual warning message about experimental features (the guard ones) was lacking.