Packing of Struct Fields

[Per Nordlöw]

Why is `T.sizeof` 12 instead of 8 when `U.sizeof` is 8 in the 
following example?

struct S
{
     int i;
     bool b;
}

struct T
{
     S s;
     char c;
}

struct U
{
     int i;
     bool b;
     char c;
}

?