Macro boa_gc::custom_trace

macro_rules! custom_trace {
    ($this:ident, $marker:ident, $body:expr) => { ... };
}

Utility macro to manually implement Trace on a type.

You define a this parameter name and pass in a body, which should call mark on every traceable element inside the body. The mark implementation will automatically delegate to the correct method on the argument.

Safety

Misusing the mark function may result in Undefined Behaviour.