http://d.puremagic.com/issues/show_bug.cgi?id=7808
Summary: Nullable's alias this does not work with structs
containing classes
Product: D
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: regression
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: jmdavisp...@gmx.com
--- Comment #0 from Jonathan M Davis <jmdavisp...@gmx.com> 2012-04-01 22:18:58
PDT ---
This code compiled just fine with 2.058
import std.typecons;
void main()
{
auto s = Nullable!S(S(new C));
func(s);
}
class C
{
}
struct S
{
C c;
this(C c)
{
this.c = c;
}
}
void func(S s)
{
}
But it fails to compile with the latest dmd, giving the error
q.d(6): Error: function q.func (S s) is not callable using argument types
(Nullable!(S))
q.d(6): Error: cannot implicitly convert expression (s) of type Nullable!(S) to
S
It works if the member variable is an int or string. It works if the member
variable is a struct type which does _not_ have a class as a member variable.
But if the struct has a member variable which is a class, or it has a member
variable which is a struct which has a member variable which is a class, then
it fails.
Nullable!S' alias this should convert it to an S when passed to func, but it
doesn't when S contains a member variable which is a class - either directly or
indirectly.
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