Macro fuchsia_trace::duration_begin

macro_rules! duration_begin {
    ($category:expr, $name:expr $(, $key:expr => $val:expr)*) => { ... };
}

Convenience macro for the duration_begin function.

Example:

duration_begin!("foo", "bar", "x" => 5, "y" => "boo");

is equivalent to

duration_begin(cstr!("foo"), cstr!("bar"),
    &[ArgValue::of("x", 5), ArgValue::of("y", "boo")]);