with the function:

int bar(auto p){};

using the C api,

• auto is reported as a TypeRef with kind unexposed
• p is reported as ParmDecl with kind unexposed

I believe it should be only reporting p as ParmDecl with type Auto ( CXType_Auto in Index.h), not visiting the "auto" keyword at all. (Same as happens with VarDecl in the case of auto i = 42 )