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import std.stdio;
 
void foo(void delegate(int, int) x) { x(5, 10); }
 
void main()
{
    foo((a, b) { writeln(a+b); });
}

prog.d(7): Error: identifier 'a' is not defined
prog.d(7): Error: a is used as a type
prog.d(7): Error: cannot have parameter of type void
prog.d(7): Error: identifier 'b' is not defined
prog.d(7): Error: b is used as a type
prog.d(7): Error: cannot have parameter of type void
prog.d(7): Error: cannot have parameter of type void
prog.d(7): Error: cannot have parameter of type void
prog.d(7): Error: function prog.foo (void delegate(int, int) x) is not callable using argument types (int delegate(void, void))
prog.d(7): Error: cannot implicitly convert expression (__dgliteral1) of type int delegate(void, void) to void delegate(int, int)

Standard output is empty