The D spec mentions something called mixin types:

If I'm understanding the grammar right, it means you can use a string mixin anywhere a Type would normally go, for example:

int func(mixin("int") x)
    return x;

However, when I try to compile that fragment (using dmd 2.086.1), it fails with the following error:

.\mixintype.d(1): Error: basic type expected, not `mixin`

...and then a few more cascading errors as a result of it not understanding the mixin.

I've tried placing the mixin on the right hand side of an alias declaration, but that didn't work either.

I've found literally nothing about this feature online except for the official spec so I'm starting to question whether this is an actual language feature or not...

I'd really like it to exist, otherwise I'd need to use a regular mixin declaration to define the entire function.

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