In ยง 19.18.7 [1] it is said that
Nested functions always have the D function linkage type.
Why and for what application is that important? As this example
~~~znested.d
void foo () { }
unittest {
void nested () { }
import std.stdio;
writeln (typeof (nested).stringof);
writeln (typeof (&nested).stringof);
writeln (typeof (foo).stringof);
writeln (typeof (&foo).stringof);
}
~~~
$ dmd -unittest -checkaction=context -main -run znested.d
pure nothrow @nogc @safe void()
void delegate() pure nothrow @nogc @safe
void()
void function()
1 unittests passed
shows from the object with D function linkage type named "nested"
a delegate is created as soon as its address is taken. (function
pointers are only generated from static nested functions)
[1] https://dlang.org/spec/function.html#nested
