Please allow mix declarations and expressions on tuple deconstruction

[Thaina]

var x = 0;
(var y,var z) = (0,0);

(var w,x) = (0,0); // ERROR : A deconstruction cannot mix declarations and expressions

Are there any thing that make this syntax cannot be possible?

[jnm2]

From https://github.com/dotnet/csharplang/issues/365:

This reformulation of deconstruction allows us to remove from the syntax model the new statement form for a deconstruction declaration. It also allows us to generalize what we allow in the future:

int x;
(x, int y) = e;

Here, the left-hand-side contains a mixture of already-existing variables (in this case x) and newly declared variables (int y). And it can be used in an expression context as well (e.g. as the body of an expression-bodied method).

[Thaina]

Thanks

[jnm2]

I'm not aware of any outstanding request for this though, so if you want it to happen you might need to reopen.

[gafter]

Dup of #125