issue 7302: Parsing of template args in single-quotes is incorrect.

In case we encounter an unescaped single or double quote during specialization we search for the closing quote.
We are cionnsidering potential escape sequences in the strings as well.

src/scanner.l

@@ -751,6 +751,8 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 %x	GCopyCurly
 %x	SkipUnionSwitch
 %x	Specialization
+%x	SpecializationSingleQuote
+%x	SpecializationDoubleQuote
 %x	FuncPtrInit
 %x	FuncFunc
 %x	FuncFuncEnd
@@ -6145,6 +6147,19 @@ OPERATOR  "operator"{B}*({ARITHOP}|{ASSIGNOP}|{LOGICOP}|{BITOP})
 <Specialization>"typename"{BN}+		{ lineCount(); }
 <Specialization>"("			{ *specName += *yytext; roundCount++; }
 <Specialization>")"			{ *specName += *yytext; roundCount--; }
+
+<Specialization>"\\\\"			{ *specName += *yytext;}
+<Specialization>"\\'"			{ *specName += *yytext;}
+<Specialization>"\\\""			{ *specName += *yytext;}
+<Specialization>"'"			{ *specName += *yytext;BEGIN(SpecializationSingleQuote);}
+<Specialization>"\""			{ *specName += *yytext;BEGIN(SpecializationDoubleQuote);}
+<SpecializationSingleQuote,SpecializationDoubleQuote>"\\\\"       { *specName += *yytext;}
+<SpecializationSingleQuote>"\\'"        { *specName += *yytext;}
+<SpecializationSingleQuote>"'"          { *specName += *yytext; BEGIN(Specialization);}
+<SpecializationDoubleQuote>"\\\""       { *specName += *yytext;}
+<SpecializationDoubleQuote>"\""         { *specName += *yytext; BEGIN(Specialization);}
+<SpecializationSingleQuote,SpecializationDoubleQuote>.          { *specName += *yytext;}
+
 <Specialization>.			{
   					  *specName += *yytext;
   					}