This prints "foo=2" which surprised me because I was unaware that T1
had got another foo via T3 (with less composition depth).
If I put T4 directly into T1, Go would detect the ambiguity of t1.foo
(because the composition depth is the same).
There is no ambiguity because `T4.foo` is not promoted to a field of
`T1`. `T4.foo` *is* a promoted field of `T2` but promotion is not
transitive.
see https://play.golang.org/p/GFgJGTSGGd
Read about this on:
* https://golang.org/ref/spec#Struct_types
* https://golang.org/ref/spec#Selectors
Lutz
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