Syntax bug

[Pavel A. Kalugin]

Here's the code snippet revealing the bug in the C++ parser:

////////////////////////////////////////////////////////////
class X {
public:
	X() : data(new char[10]){}	
	~X() {
		delete[] data;
	}	
	operator const char* () const {return data;}	
	operator char* () {return data;}	
private:
	char* data;
};

void
foo()
{
  X x;
  x[0]='q';
}
///////////////////////////////////////////////////////////////

I got the following when compiling it with egsc:

x.cpp: In function `void foo()':
x.cpp:17: ambiguous conversion for array subscript     

On the other hand, an _incorrect_ declaration 

const operator char* () const {return data;}

makes the compiler quite happy. This bug existed in gcc-2.7.2.3 as well.

The specs of the compiler are:

Reading specs from /usr/local/egcs/lib/gcc-lib/i586-pc-linux-gnulibc1/egcs-2.90.23/specs
gcc version egcs-2.90.23 980102 (egcs-1.0.1 release)  

Thanks,

-Pavel