Like exists() but evaluated at compile time. This is useful to skip a block where a function is used that would otherwise give an error: if exists_compiled('*ThatFunction') ThatFunction('works') endif If exists() were used then a compilation error would be given if ThatFunction() is not defined. {expr} must be a literal string. Can only be used in a |:def| function. This does not work to check for arguments or local variables.