Orphan format arguments: args[0..1]
Steven Schveighoffer
schveiguy at gmail.com
Sun Dec 16 20:00:35 UTC 2018
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
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