nonstandard extension used : function declaration from a previous block
If a function is not visible in the current scope, Microsoft C/C++ finds function declarations that would not otherwise be available.
The following example causes this warning:
void func1()
{
void func2();
}
void func3()
{
func2(); // warning
}
This extension can prevent your code from being portable to other compilers and will generate an error under the /Za command-line option.