On Monday, 9 April 2018 at 11:06:50 UTC, Shachar Shemesh wrote:
struct S {
  int a;
  int[5000] arr = void;

void func() {
  S s;

During the s initialization, the entire "S" area is initialized, including the member arr which we asked to be = void.

Is this a bug?


Not semantically, but you might consider it a performance bug.
This particular one could be fixed, put I cannot say how messy the details are. There is potential for code that silently relies on the behavior and would break in very non-obvious ways if we fixed it.

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