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I was recently modifying some code, and found a pre-existing bug on one line within a function:
std:;string x = y;
This code still compiles and has been working as expected.
The string definition works because this file is using namespace std;, so the std:: was unnecessary in the first place.
The question is, why is std:; compiling and what, if anything, is it doing?
std:its a label, usable as a target forgoto.As pointed by @Adam Rosenfield in a comment, it is a legal label name.
C++03 §6.1/1: