Alignment for nested typedef incorrect

[TwoClocks]

typedef int I1 __attribute__((aligned(8)));
typedef I1 I2 __attribute__((aligned(1)));

_Static_assert(sizeof(I2) == 4,"record I2 wrong sizeof");
_Static_assert(_Alignof(I2) == 1, "record I2 wrong alignment");

the alignment of I2 fails. It returns 8. It should be one.

It looks like I2 has I1 attributes as well as its own. Seems like typedefs "roll up" attributes of the types they refer to.

typedef: 'attributed(int)'
attr: aligned alignment: Attribute.Alignment{ .node = Tree.NodeIndex.none, .requested = 8 }
name: I1

typedef: 'attributed(int)'
attr: aligned alignment: Attribute.Alignment{ .node = Tree.NodeIndex.none, .requested = 8 }
attr: aligned alignment: Attribute.Alignment{ .node = Tree.NodeIndex.none, .requested = 1 }
name: I2

[TwoClocks]

Some more info on this. It looks like I2 has I1 attributes as well as it's own. I think this is the main issue.

typedef: 'attributed(int)'
 attr: aligned alignment: Attribute.Alignment{ .node = Tree.NodeIndex.none, .requested = 8 }
 name: I1

typedef: 'attributed(int)'
 attr: aligned alignment: Attribute.Alignment{ .node = Tree.NodeIndex.none, .requested = 8 }
 attr: aligned alignment: Attribute.Alignment{ .node = Tree.NodeIndex.none, .requested = 1 }
 name: I2