Bug 19519 – cannot determine length of static array at compile time

https://travis-ci.com/libmir/mir-runtime/jobs/165915690 source/mir/exception.d(197,16): Error: cannot determine length of MirException(null, null, 0LU, null, null, 0u, false, [__void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void, __void])._payload at compile time source/mir/exception.d(117,63): called from here: initilizePayload(this._payload, msg) source/mir/exception.d(117,79): called from here: delegate () => cast(immutable(string))initilizePayload(this._payload, msg)() source/mir/exception.d(117,14): called from here: super.this(delegate () => cast(immutable(string))initilizePayload(this._payload, msg)(), file, line, nextInChain) source/mir/exception.d(66,23): called from here: func("compile-time check") source/mir/exception.d(66,5): while evaluating: static assert(cast(int)func("compile-time check") == 1)

Recent DMD BETA and DMD nightly

Reduced test case: private enum maxMsgLen = 1; class C { private char[maxMsgLen] _payload = void; } void initilizePayload(ref return char[maxMsgLen] payload, scope const(char)[] msg) { payload[0 .. msg.length] = msg; } /// unittest { bool func() { /// scope messages are copied auto m = new C(); initilizePayload(m._payload, "msg"); return __ctfe; } static assert(func() == 1); } =========== onlineapp.d(12): Error: cannot determine length of C([__void])._payload at compile time onlineapp.d(22): called from here: initilizePayload(m._payload, "msg") onlineapp.d(26): called from here: func() onlineapp.d(26): while evaluating: static assert(cast(int)func() == 1)

@kubo39 created dlang/dmd pull request #9634 "Fix Issue 19519 - cannot determine length of static array at compile …" fixing this issue: - Fix Issue 19519 - cannot determine length of static array at compile time https://github.com/dlang/dmd/pull/9634

dlang/dmd pull request #9634 "Fix Issue 19519 - cannot determine length of static array at compile …" was merged into stable: - 171ea64a00caaf1aecb9e782b3c848ff6c90d750 by Hiroki Noda: Fix Issue 19519 - cannot determine length of static array at compile time https://github.com/dlang/dmd/pull/9634