Meaning of the dot-function syntax

[Anonymouse]

On Sunday, 1 October 2023 at 08:22:48 UTC, dhs wrote:
> Hi,
>
> What's the meaning of the dot in the call to writeln() below?
>
> ```d
>     .writeln("Hello there!");
> ```
>
> I haven't found this in the spec or anywhere else. This is used 
> very often in the source code for Phobos.
>
> Thanks,
> dhs

Quote https://dlang.org/spec/module.html#module_scope_operators;

> A leading dot (`.`) causes the identifier to be looked up in 
> the module scope.
> 
> ```d
> int x;
>
> int foo(int x)
> {
>     if (y)
>         return x;  // returns foo.x, not global x
>     else
>         return .x; // returns global x
> }
> ```