Template declaration of std.typecons.isTuple in -X JSON file.

[realhet]

On Wednesday, 15 January 2025 at 21:55:30 UTC, monkyyy wrote:
> On Wednesday, 15 January 2025 at 21:00:35 UTC, realhet wrote:
>> On Wednesday, 15 January 2025 at 20:27:18 UTC, Steven 
>> Schveighoffer wrote:
>>> On Wednesday, 15 January 2025 at 12:01:21 UTC, realhet wrote:
>>
>>> Also seems like invalid syntax. Where does this come from?
>>
>> It's in std.typecons.d -> [git 
>> link](https://github.com/dlang/phobos/blob/336bed6d8ffec74d117b755866c5bd22e3d610a1/std/typecons.d#L2278C4-L2279C18)
>>
>> It's in the declaration of enum isTuple(T) = ....
>
>>> github: `f(Specs...)(Tuple!Specs tup)`
>
>>> your post: `template f(Specs...)f(T.init);`
>
> thats quite the important detail, its pattern matching

Thanks, I understand it now.  It indeed valid in the typecons.d 
module.
- A declaration of a template function f with empty body {}
- And the it calls the f function with the T.init parameter.

And this is how I got that weird template declaration later:

Run this commmand:
```
ldc2 -o- -X c:\d\ldc2\import\std\typecons.d
```

The resulting typecons.json file will fontain information about 
the isTuple declaration:
```json
{
     "kind" : "template",
     "protection" : "public",
     "line" : 2277,
     "char" : 6,
     "name" : "isTuple",
     "parameters" : [
      {
       "name" : "T",
       "kind" : "type"
      }
     ],
     "members" : [
      {
       "name" : "isTuple",
       "kind" : "variable",
       "line" : 2277,
       "char" : 6,
       "storageClass" : [
        "enum"
       ],
       "init" : "__traits(compiles, ()\r\n{\r\ntemplate 
f(Specs...)f(T.init);\r\n}\r\n)"
      }
     ]
    }
```

And there it is, inside the "init" field.

So it seems like that X Json exporter had a little bug there.  It 
misinterprets the 'f' function declaration and the 'f' function 
calling statements.

Otherwise I'm happy because I've managed to put together a 6MB 
DLang-ish file with all the declarations in Phobos.  And the only 
error was this.

(Why I do this? -> I want to make something like IntelliSense. 
Now that I have all the data loaded from the X Json files, I 
transformed them into a large D source to be able to verify. This 
is what it looks like: [youtube 
link](https://www.youtube.com/watch?v=GGrpEVsqCeY))