Macro si_trace_print::pfn

macro_rules! pfn {
    (
        $($args:tt)*
    ) => { ... };
}

println! in a function when entering.

To signify entering a function. Use this as the first println! in a function.

use si_trace_print::{pfn, pfx};
fn func1() {
    pfn!("hello");
}
fn main() {
    pfn!();
    func1();
    pfx!();
}

prints

→main:
   →func1: hello
←main:

Uses sn().