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Bug 17572 – unrestricted union erroneously invokes postblit

Status: RESOLVED
Resolution: INVALID
Severity: critical
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2017-06-29T13:11:00Z
Last change time: 2017-07-03T10:29:01Z
Assigned to: nobody
Creator: wyrlon

Comments

Comment #0 by wyrlon — 2017-06-29T13:11:56Z

Expected Behavior: prints 0 Observed Behavior: prints 1 import std.stdio; long post = 0; struct Node { uint val; this(this) { ++post; } } union POD(T) { T val; } POD!Node g; void Put(ref Node val) { g = cast(POD!Node)val; } void main() { auto x = Node(5); x.Put(); post.writeln; }

Comment #1 by kinke — 2017-06-29T19:50:23Z

Not a bug, as the copy and postblit happens correctly when constructing the `cast(POD!Node)val` rvalue, see https://github.com/ldc-developers/ldc/issues/2185.