Fix const struct parameter overload matching

oscar64/Declaration.cpp

@@ -31,6 +31,17 @@ DeclarationScope::~DeclarationScope(void)
 	delete[] mHash;
 }
 
+DeclarationScope* DeclarationScope::Clone(void) const
+{
+	DeclarationScope* scope = new DeclarationScope(mParent, mLevel, mName);
+	for (int i = 0; i < mHashSize; i++)
+	{
+		if (mHash[i].mIdent)
+			scope->Insert(mHash[i].mIdent, mHash[i].mDec);
+	}
+	return scope;
+}
+
 const Ident* DeclarationScope::Mangle(const Ident* ident) const
 {
 	if (mName && ident)

oscar64/Declaration.h

@@ -166,6 +166,8 @@ public:
 	ScopeLevel		mLevel;
 	const Ident	*	mName;
 
+	DeclarationScope* Clone(void) const;
+
 	DeclarationScope* mParent;
 protected:
 	struct Entry

oscar64/Parser.cpp

@@ -7483,6 +7483,21 @@ int Parser::OverloadDistance(Declaration* fdec, Expression* pexp)
 			{
 				dist += 32;
 			}
+			else if (ptype->mType == DT_TYPE_STRUCT && etype->mType == DT_TYPE_STRUCT)
+			{
+				int	ncast = 0;
+				Declaration* ext = ex->mDecType;
+				while (ext && !ext->IsConstSame(ptype))
+				{
+					ncast++;
+					ext = ext->mBase;
+				}
+
+				if (ext)
+					dist += 32 * ncast;
+				else
+					return NOOVERLOAD;
+			}
 			else
 				return NOOVERLOAD;
 
@@ -11149,6 +11164,7 @@ Declaration* Parser::ParseTemplateExpansion(Declaration* tmpld, Declaration* exp
 			p->mScanner->Replay(tmpld->mBase->mTokens);
 
 			tdec = tmpld->mBase->Clone();
+			tdec->mScope = tdec->mScope->Clone();
 			tdec->mScope->mName = expd->mScope->mName;
 			tdec->mScope->mParent = expd->mScope;