calling a function in vimrc before defining it

I wrote a function in my vimrc that builds my statusline (I use it to toggle certain elements). The function call occurs earlier in the file than the actual definition, and I wondered whether that would be a problem, but when I started up MacVim it all worked fine. In terminal Vim however, I get an error on startup (E117: Unknown function: BuildStatusLn), though it still works fine.

Is there a way around this? Is it bad practice? Does anyone know why it's not raising an error in MacVim?

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