Fixed a crash when parsing type aliases.

This was caused by a change in behaviour in Clang - a8770a7e8e (SVN revision 346146).

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/CppParser/Parser.cpp

@@ -2475,7 +2475,7 @@ Type* Parser::WalkType(clang::QualType QualType, const clang::TypeLoc* TL,
         TST->_template = static_cast<Template*>(WalkDeclaration(
             Name.getAsTemplateDecl()));
         if (TS->isSugared())
-            TST->desugared = GetQualifiedType(TS->desugar(), TL);
+            TST->desugared = GetQualifiedType(TS->getCanonicalTypeInternal(), TL);
 
         TypeLoc UTL, ETL, ITL;
 
@@ -2518,7 +2518,7 @@ Type* Parser::WalkType(clang::QualType QualType, const clang::TypeLoc* TL,
         auto TST = new DependentTemplateSpecializationType();
 
         if (TS->isSugared())
-            TST->desugared = GetQualifiedType(TS->desugar(), TL);
+            TST->desugared = GetQualifiedType(TS->getCanonicalTypeInternal(), TL);
 
         TypeLoc UTL, ETL, ITL;
 
@@ -2706,7 +2706,7 @@ Type* Parser::WalkType(clang::QualType QualType, const clang::TypeLoc* TL,
 
         auto UTT = new UnaryTransformType();
         auto Loc = TL->getAs<UnaryTransformTypeLoc>().getUnderlyingTInfo()->getTypeLoc();
-        UTT->desugared = GetQualifiedType(UT->isSugared() ? UT->desugar() : UT->getBaseType(), &Loc);
+        UTT->desugared = GetQualifiedType(UT->isSugared() ? UT->getCanonicalTypeInternal() : UT->getBaseType(), &Loc);
         UTT->baseType = GetQualifiedType(UT->getBaseType(), &Loc);
 
         Ty = UTT;
@@ -2733,7 +2733,7 @@ Type* Parser::WalkType(clang::QualType QualType, const clang::TypeLoc* TL,
     {
         auto AT = Type->getAs<clang::AutoType>();
         if (AT->isSugared())
-            Ty = WalkType(AT->desugar());
+            Ty = WalkType(AT->getCanonicalTypeInternal());
         else
             return nullptr;
         break;

tests/Common/Common.h

@@ -1457,3 +1457,12 @@ class MyIntList : public MyList<int>
 };
 
 void MyFunc(MyList<void *> *list);
+
+template<class T> using InvokeGenSeq = typename T::Type;
+
+template<int N> struct DerivedTypeAlias;
+template<int N> using TypeAlias = InvokeGenSeq<DerivedTypeAlias<N>>;
+
+template<int N>
+struct DerivedTypeAlias : TypeAlias<N / 2> {};
+