Assignee expressions can contain call expressions (tuple structs)

[theemathas]

See also #2208 for more on assignee expressions.

The following code compiles:

struct Thing(i32, i32);

fn main() {
    let x;
    Thing(x, *&mut 0) = Thing(1, 2);
}

This means that the tuple struct syntax can be used in assignee expressions.

However, in expressions, the tuple struct syntax seems to be parsed as a call expression. And call expressions aren't listed as a legal assignee expression. Thus, the compiler and the reference disagree with each other.