Expansion of D @nogc

original text

import std.traits;
 //  Convert from a function or closure type `@nogc`
auto assumeNoGC(T) (T t) if (isFunctionPointer!T || isDelegate!T)
{
    
    enum attrs = functionAttributes!T | FunctionAttribute.nogc;
    return cast(SetFunctionAttributes!(T, functionLinkage!T, attrs)) t;
}

 // Can't press `@nogc` Marker function , But you know you don't use garbage collection 
void funcThatMightUseGC(int timeout)
{
    
    if (unlikelyCondition(timeout))
        throw new Exception(" Thrown ");

    doMoreStuff();
}

void funcThatCantAffortGC() @nogc
{
    
    //  Call garbage collection with transformation closure .
    assumeNoGC( (int timeout)
        {
    
            funcThatMightUseGC(timeout);
        })(10000);
}