[cfe-dev] Tracing Typedef Chain

[Daniel Dilts via cfe-dev]

If I have code like this:

typedef int X;
typedef X Y;
typedef Y Z;

Z i = 0;

I have the QualType for i.  getAsString() returns "Z".
getCanonicalType().getAsString() returns "int".

Is there some way to trace the typedef chain such that I get "Z", "Y", "X",
and "int"?  Order is not particularly important to me, but it would be nice
to get them in that order.
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