Macro si_trace_print::function_name::function_name_plus

macro_rules! function_name_plus {
    ($plus:literal) => { ... };
}

Return the current function name plus preceding namespaces as a &'static str.

For example,

• function_name_plus!(1) returns "my_struct::my_func"
• function_name_plus!(2) returns "my_mod::my_struct::my_func"

function_name_plus!(0) is equivalent to function_name!().

function_name_plus must be a macro (and not a function) to reliably use std::any::type_name::<T>() introspection.