Member access expressions
A member access expression is an expression that consists of a primary expression followed by a dot (.) and an identifier. The primary expression must have a struct type that contains a member with the identifier as its name. The type of the member access expression is the type of the member that the identifier refers to.
Example:
struct Point {
x: usize,
y: usize,
}
fn foo(p: Point) -> usize {
p.x
}