Struct literals should use assignability for their fields

[pcwalton]

I see no reason why this wouldn't be safe, and I was bitten by this when using slices and unique strings.

[catamorphism]

Not critical for 0.6, de-milestoning

[alexcrichton]

Is this still a relevant issue? This sounds like it has something to do with mutable fields which have since been deleted.

[emberian]

I don't even know what this means.

@pcwalton?

[alexcrichton]

Closing this due to its age and irrelevance now.