I am not sure what's happening here (so no keywords), probably I am missing something. I am not even sure this is a bug, so it's better to ask here first. This crashes at runtime with no stack trace (DMD 2.053): import std.stdio, std.bigint, std.container; int foo() { Array!BigInt bar; bar ~= BigInt(2); auto spam = heapify(bar); spam.insert(BigInt(10)); spam.insert(BigInt(20)); return 1; } void main() { writeln(foo()); } If I replace the BigInts with ints: import std.stdio, std.container; int foo() { Array!int bar; bar ~= 2; auto spam = heapify(bar); spam.insert(10); spam.insert(20); return 1; } void main() { writeln(foo()); } I get: ...\dmd\src\phobos\std\container.d(2660): Error: this._store()[this._length()] is not an lvalue
I've got a stack trace for the first code in OS X. core.exception.AssertError@std.typecons(2366): Assertion failure ---------------- 5 x 0x00016a8d onAssertError + 65 6 x 0x00020ace _d_assertm + 30 7 x 0x00044e8c void std.typecons.__assert(int) + 24 8 x 0x000041ea void std.typecons.__T10RefCountedTS3std9container30__T5ArrayTS3std6bigint6BigIntZ5Array7PayloadVE3std8typecons24RefCountedAutoInitialize0Z.RefCounted.__dtor() + 38 9 x 0x00004407 void std.container.Array!(std.bigint.BigInt).Array.__fieldDtor() + 11 10 x 0x00001f66 int x.foo() + 310 11 x 0x00001e27 _Dmain + 11 12 x 0x000211ef extern (C) int rt.dmain2.main(int, char**).void runMain() + 23 13 x 0x00020d99 extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void delegate()) + 29 14 x 0x00021237 extern (C) int rt.dmain2.main(int, char**).void runAll() + 59 15 x 0x00020d99 extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void delegate()) + 29 16 x 0x00020d33 main + 179 17 x 0x00001e11 start + 53 18 ??? 0x00000001 0x0 + 1 ----------------
*** Issue 6959 has been marked as a duplicate of this issue. ***
This seems to have been fixed.
Tested both, each prints 1 and returns normally. I assume some other fix took care of this.