Declaring "int a, b;" as member fields of a class/struct results in parsing error

Submitted by Jaap A. Haitsma

Link to original bug (#530030)

Description

Compiling example below

public class Sample {
        int a, b;

        static int main (string[] args) {
                int x, y;
                return 0;
        }
}

gives

/home/haitsma/blah.vala:3.7-3.7: error: syntax error, expected declaration