This code fails to compile with any current version of g++ from 4.7 to 7.0:

```
int main(){
_infinite_retry:
	[=]{
	_infinite_retry:
		goto _infinite_retry; // go to the second _infinite_retry.
	}();
	goto _infinite_retry; // go to the first _infinite_retry.
}
```

D:\Desktop>g++ test.cpp -Wall
test.cpp: In function 'int main()':
test.cpp:2:2: warning: label '_infinite_retry' defined but not used [-Wunused-label]
  _infinite_retry:
  ^~~~~~~~~~~~~~~
test.cpp:7:8: error: label '_infinite_retry' used but not defined
   goto _infinite_retry; // go to the outer _infinite_retry.
        ^~~~~~~~~~~~~~~


Quoting from the standard:
```
ISO/IEC WG21 N4582 

5.1.2 Lambda expressions [expr.prim.lambda]
8 The lambda-expression’s compound-statement yields the function-body (8.4) of the function call operator, ...

3.3.5 Function scope [basic.funscope]
1 Labels (6.1) have function scope and may be used anywhere in the function in which they are declared. Only
labels have function scope.
```

The compound statement of a lambda expression is a function body thus it creates a function scope. The second label should reside in that scope but somehow nullifies the first one, causing the second goto statement to fail to find the first label.