http://d.puremagic.com/issues/show_bug.cgi?id=6681
Summary: bogus duplicate union initialization or overlapping
initialization errors
Product: D
Version: D1 & D2
Platform: Other
OS/Version: Mac OS X
Status: NEW
Severity: regression
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: fa...@gmx.ch
--- Comment #0 from Fawzi Mohamed <fa...@gmx.ch> 2011-09-16 10:42:44 PDT ---
In D1 code like this
{{{
module t;
template MTuple( TList... )
{
alias TList MTuple;
}
struct V{
union {
double[2] cell;
version(v2) {} else {
MTuple!(double,double) tuple;
}
struct {
union { double x; double r; }
union { double y; double g; }
}
}
static const V zero={x:0, y:1};
}
V a=V.zero;
version(v2) {
struct Q {
union {
struct {
double x, y;
}
V xyzw;
}
const static Q id = { x: 0, y:1 };
}
Q b=Q.id;
}
}}}
fails with duplicate union initialization, which is incorrect.
This happens both with and without -version=v2 which shows that the error is
not just the tuple.
Closely related errors are present also in D2, even if one uses constructors:
{{{
module t;
template MTuple( TList... )
{
alias TList MTuple;
}
struct V{
this(double a,double b){
x=a;
y=b;
}
union {
double[2] cell;
version(v2) {} else {
MTuple!(double,double) tuple;
}
struct {
union { double x; double r; }
union { double y; double g; }
}
}
static immutable V zero=V(0,1);
}
V a=V.zero;
version(v2) {
struct Q {
union {
struct {
double x, y;
}
V xyzw;
}
immutable static Q id =Q(0,1);
}
Q b=Q.id;
}
}}}
similar errors seem to be very old:
http://www.digitalmars.com/d/archives/digitalmars/D/bugs/6271.html
and there are related or very similar errors are already present in bugzilla:
http://d.puremagic.com/issues/show_bug.cgi?id=4241 which basically uses the
same code as me (omg derived vector structs), but just complains about line
number, seemingly accepting the error (which is bogus imho.
I have also tried to sprinkle around some =void but I just managed to end up
with "Error: no initializer for union".
http://d.puremagic.com/issues/show_bug.cgi?id=1432 (using initializers in the
union)
but this one at least with D1 is a regression from 1.067 at least
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