Bug 12871 – inner function returning pointer to outer context local rejected

When writing an inner function, or lambda, that will not escape a local for that function's scope, but instead escapes a local for the enclosing scope, the compiler rejects it with the message "Error: escaping reference to local" Example: void foo() { int a; int *dg(){return &a;} } Clearly, a will not escape its scope through dg. Such a function may be used to modularize parts of the function, and so should not be flagged as invalid. If the delegate is returned, it should create a closure anyway. Such constructs are very important to get right because the expected way to apply certain attributes such as @trusted to an expression inside a @safe function are via a lambda expression.

It's allowed in 2.067a.