Re: Orphan format arguments: args[0..1]

[Steven Schveighoffer via Digitalmars-d-learn]

On 12/15/18 7:34 PM, Ali Çehreli wrote:
This one confused me until I decided to talk to a rubber ducky:
import std.string;

void main() {
     auto s = "%s is a good number".format(42);
}

Fine; it works... Then the string becomes too long and I split it:

     auto s = "%s is a good number but one needs to know" ~
              " what the question exactly was.".format(42);

Now there is a compilation error:

   Orphan format arguments: args[0..1]

Hm... maybe a runtime error? I didn't think the compiler knows to 
complain about this.


What? Is that a bug in format? It can't be because the string should be 
concatenated by the compiler as a single string, no? No: operator dot 
has precedence over ~, so format is applied to the second part of the 
string before the concatenation. Doh! This puzzled me a lot.

Yes, in fact that is kind of a difference from previous 
"auto-concatenation" if you just put whitespace between the strings.

-Steve