[Issue 19002] __FUNCTION__ and __PRETTY_FUNCTION__ are not C string literals

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19002

--- Comment #2 from Steven Schveighoffer <schveiguy at yahoo.com> ---
No, this is not expected. I can use printf with a string literal, and it works,
even if it's via an enum, or some const folding. The compiler implicitly can
cast a string literal to a const(char*), otherwise using C functions with
string literals would be painful.

For example:

printf("hello" ~ "\n"); // ok
enum x = "hello";
printf(x); // ok
enum y = __FUNCTION__;
printf(y); // nope
enum z = ctfeFunction();
printf(z); // nope

I think all of these should work, they are all string literals, and should be 0
terminated.

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