error : $S1 : modifiers not allowed ?!

Hello,

the following source code is not correct, but i cannot understand the error
message:

foo.cpp(20) : error C2270: '$S1' : modifiers not allowed on nonmember
functions
foo.cpp(20) : error C4430: missing type specifier - int assumed. Note: C++
does not support default-int

what does this $S1 mean?

Here is the sample:

======= foo.cpp ===========
class Foo;

class Bar
{
public:
operator Foo() const;
};

struct Foo;

typedef struct Foo
{
} Foo;


Bar::operator Foo() const
{
return Foo();
}
============================

cl -W4 -nologo foo.cpp
foo.cpp
foo.cpp(12) : warning C4099: 'Foo' : type name first seen using 'class' now
seen using 'struct'
foo.cpp(2) : see declaration of 'Foo'
foo.cpp(15) : warning C4099: 'Foo' : type name first seen using 'class' now
seen using 'struct'
foo.cpp(2) : see declaration of 'Foo'
foo.cpp(19) : error C2738: 'operator Foo' : is ambiguous or is not a member
of 'Bar'
foo.cpp(7) : see declaration of 'Bar'
foo.cpp(20) : error C2270: '$S1' : modifiers not allowed on nonmember
functions
foo.cpp(20) : error C4430: missing type specifier - int assumed. Note: C++
does not support default-int
foo.cpp(21) : error C2440: 'return' : cannot convert from 'Foo' to 'int'
No user-defined-conversion operator available that can perform this
conversion, or the operator cannot be called
foo.cpp(22) : error C2617: '$S1' : inconsistent return statement
foo.cpp(19) : see declaration of '$S1'



.

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