[Issue 6456] New: toString fails with alias this when more than one field present
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Mon Aug 8 11:22:51 PDT 2011
http://d.puremagic.com/issues/show_bug.cgi?id=6456
Summary: toString fails with alias this when more than one
field present
Product: D
Version: D2
Platform: Other
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody at puremagic.com
ReportedBy: andrej.mitrovich at gmail.com
--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2011-08-08 11:22:46 PDT ---
import std.stdio;
import std.conv;
struct Foo
{
string toString() { return to!string(x); }
alias x this;
int x;
int y; // comment this out and the bug is gone
}
void main()
{
auto foo = Foo();
writeln(foo);
}
If you comment out "int y;" the bug is gone, otherwise you get back this little
thingy:
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\conv.d(100): Error: template
std.conv.toImpl(T,S) if (!implicitlyConverts!(S,T) && isSomeString!(T) &&
isInputRange!(Unqual!(S)) && isSomeChar!(ElementType!(S))) does not match any
function template declaration
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\conv.d(100): Error: template
std.conv.toImpl(T,S) if (!implicitlyConverts!(S,T) && isSomeString!(T) &&
isInputRange!(Unqual!(S)) && isSomeChar!(ElementType!(S))) cannot deduce
template function from argument types !(int)(Foo)
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\conv.d(100): Error: template
instance errors instantiating template
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\format.d(1683): Error: template
instance std.conv.to!(int).to!(Foo) error instantiating
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\format.d(328): instantiated
from here: getNthInt!(Foo)
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(678): instantiated
from here: formattedWrite!(LockingTextWriter,immutable(char),Foo)
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(1511): instantiated
from here: write!(Foo,char)
test.d(18): instantiated from here: writeln!(Foo)
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\format.d(328): Error: template
instance std.format.getNthInt!(Foo) error instantiating
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(678): instantiated
from here: formattedWrite!(LockingTextWriter,immutable(char),Foo)
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\stdio.d(1511): instantiated
from here: write!(Foo,char)
test.d(18): instantiated from here: writeln!(Foo)
Failed: dmd -d -debug -w -wi -unittest -v -o- "test.d" -I"." >test.d.deps
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