PR c++/87366 - wrong error with alias template.
With this testcase the code in template_args_equal to treat aliases as distinct wasn't sufficient, because it only looked at the top level, whereas here we have a reference to the alias. So let's also handle treating them as distinct in structural_comptypes. For GCC 10 I have a more comprehensive patch, but for GCC 9 let's go with this smaller change. * typeck.c (structural_comptypes): When comparing_specializations, aliases are unequal. (comptypes): When comparing_specializations, do structural comparison. From-SVN: r270494
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gcc/testsuite/g++.dg/cpp0x/alias-decl-66.C
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