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]
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.
Anyway, the solution, once again, is to use parentheses:
auto s = ("%s is a good number but one needs to know" ~
" what the question exactly was.").format(42);
Ali
