What I had in mind is the programmers' view of the code: in K&R C, every function call was visibly either direct or indirect, `f()` or `(*f)()`. My main concern

What I had in mind is the programmers' view of the code: in K&R C, every function call was visibly either direct or indirect, `f()` or `(*f)()`. My main concern is not actually performance, but comprehensibility: an indirect call is a conditional branch, where the condition can be arbitrarily far away in space and time and is not statically determinable, so it should not be invisible. I appreciate that this doesn't fit Zig's call syntax, which is unlikely to change, so the long-term best case is probably some LSP marking based on the callee type.