Allow direct array indexing of array member field in a #raw_union struct

[rowbyte]

Right now, one cannot override the swizzle fields/set custom swizzle field order or names in an array type (which is understandable). A decent workaround seems to be creating a #raw_union with the struct and an array field. But direct array indexing of this struct isn't supported.

AHLS :: struct #raw_union {
      using _  : struct {
                 alpha, hue, lightness,saturation : f32
      }

      using _ : [4] f32;
 
}

Describe the solution you'd like
Allow direct array indexing of raw-unions, if there is only one array field member inside the raw union struct.

Additional context
None.

[shayded-exe]

IMHO just adding custom swizzle names would be better, but this would also be nice.

[gingerBill]

NEVER going to happen.

[MaliusArth]

I think it would be more precise to say: export array indexing & swizzling syntax when using arrays to export them into parent scope

[shayded-exe]

Slight issue, I'm getting an error when trying to use b as a name because the default swizzling already defines it.

'b' is already declared in 'struct #raw_union {using _: struct {h, s, b: f32}, using _: [3]f32}'(checker)

HSB :: struct #raw_union {
	using _: struct {
		h, s, b: f32,
	},
	using _: [3]f32,
}

[MaliusArth]

I guess it would make sense if odin dropped the builtin aliases & swizzles (or at least made them optional) and fully supported custom aliasing & swizzling.

Starting by omitting auto array aliases & swizzles inside #raw_unions

[gingerBill]

Not going to happen. I understand why you'd want this and we experimented with it a while ago too, but it screws up a lot of rules too with using.

And in the grand scheme of things, this isn't that bad:

HSB :: struct #raw_union {
	using hsb: struct {h, s, b: f32},
	e: [3]f32,
}

col: HSB
col.s = 0.5
col.e[1] = 0.5 // an extra 2 characters to type.