Can't put a const(char)[] into a char[]

[Nicholas Wilson]

On Saturday, 21 April 2018 at 22:34:39 UTC, Steven Schveighoffer 
wrote:
> I just came across this. Can't believe there's not been more 
> people finding this:
>
> char[] buf = new char[100];
> buf.formattedWrite("This is a number: %s", 5); // Error cannot 
> put a const(char)[] into a char[]
>
>
> OK, challenge accepted!
>
> buf[0 .. myName.length] = myName[]; // Hey phobos, look, this 
> is easy!
>
> But no, of course -- autodecoding. >:(
>
> https://issues.dlang.org/show_bug.cgi?id=18790
>
> -Steve

"Use .representation" would be the official answer for the second 
hack.
But this should absolutely work. It looks this looks the same 
thing as
https://issues.dlang.org/show_bug.cgi?id=18472#c10
---
enum s = "%1$s,%2$s".format("foo","bar");
---
phobos/std/range/primitives.d(405): Error: static assert:  
"Cannot put a const(char)[] into a Appender!string."
phobos/std/format.d(1184):        instantiated from here: 
put!(Appender!string, const(char)[])
/phobos/std/format.d(473):        instantiated from here: 
writeUpToNextSpec!(Appender!string)
phobos/std/format.d(6168):        instantiated from here: 
formattedWrite!(Appender!string, char, string, string)
main.d(5):        instantiated from here: format!(char, string, 
string)

18472 broke compilation of DCompute under -betterC when upgrading 
LDC to a newer DMDFE, I "fixed" it by not compiling with -betterC 
but then Mike Franklin (thanks!) discovered the above error after 
fixing the -betterC side of things.

I'm going to be extremely unhappy if I can't compile dcompute at 
all with the latest LDC.
IMO this is a priority 1 regression.