`M0-1-4`: Recognise aggregate literal initializers

[lcartey]

Affected rules

• M0-1-4

Description

M0-1-4 identifies single use variables, but for member variables we do not recognise the initialization of variables in an aggregate initializer as a use.

In addition, we should search for other places where we count uses of member variables to ensure this case is also captured there.

Example

struct agg {
  int x;
};

void test_agg() {
  agg a = {1};
  a.x;
}