void F(int x) { }
int G<T,U>(int x) { return x; }

class A { }
class B { }

void Main()
{
    F(G<A,B>(4));
}

但是这会产生一些编译错误：

void F(bool x,bool y) { }

void Main()
{
    int G = 0,A = 1,B = 2;
    F(G<A,B>(4));
}

The type or namespace name ‘A’ could not be found (press F4 to add a using directive or assembly reference)

The type or namespace name ‘B’ could not be found (are you missing a using directive or an assembly reference?)

The variable ‘G’ is not a generic method. If you intended an expression list,use parentheses around the < expression.

所以答案是表达式F(G 函数调用.有许多方法强制编译器将其视为两个参数的单个函数调用：f(g (4))或F(G> A,B>(4)),仅举几个例子.