http://d.puremagic.com/issues/show_bug.cgi?id=7879
Summary: writeln of struct array with not const toString()
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Keywords: rejects-valid
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: bearophile_h...@eml.cc
--- Comment #0 from bearophile_h...@eml.cc 2012-04-09 13:15:55 PDT ---
Currently this code compiles and runs with no errors:
class Foo {
override string toString() const {
return "Foo";
}
}
void main() {
import std.stdio;
const Foo[] foos = [new Foo];
writeln(foos);
}
Output, DMD 2.059beta4:
[Foo]
While this code with not const Foo.toString:
class Foo {
override string toString() /*const*/ {
return "Foo";
}
}
void main() {
import std.stdio;
const Foo[] foos = [new Foo];
writeln(foos);
}
Gives:
...\dmd2\src\phobos\std\format.d(2158): Error: template instance
formatObject!(LockingTextWriter,const(Foo),char)
formatObject!(LockingTextWriter,const(Foo),char) does not match template
declaration formatObject(Writer,T,Char) if (hasToString!(T,Char))
...\dmd2\src\phobos\std\format.d(2158): Error: function expected before (), not
formatObject!(LockingTextWriter,const(Foo),char) of type void
...\dmd2\src\phobos\std\format.d(1840): Error: template instance
std.format.formatValue!(LockingTextWriter,const(Foo),char) error instantiating
...\dmd2\src\phobos\std\format.d(1579): instantiated from here:
formatRange!(LockingTextWriter,const(Foo)[],char)
...\dmd2\src\phobos\std\format.d(2572): instantiated from here:
formatValue!(LockingTextWriter,const(Foo)[],char)
...\dmd2\src\phobos\std\format.d(398): instantiated from here:
formatGeneric!(LockingTextWriter,const(Foo[]),char)
...\dmd2\src\phobos\std\stdio.d(687): ... (1 instantiations, -v to show)
...
...\dmd2\src\phobos\std\stdio.d(1574): instantiated from here:
write!(const(Foo[]),char)
test.d(9): instantiated from here: writeln!(const(Foo[]))
...\dmd2\src\phobos\std\format.d(1579): Error: template instance
std.format.formatRange!(LockingTextWriter,const(Foo)[],char) error
instantiating
...\dmd2\src\phobos\std\format.d(2572): instantiated from here:
formatValue!(LockingTextWriter,const(Foo)[],char)
...\dmd2\src\phobos\std\format.d(398): instantiated from here:
formatGeneric!(LockingTextWriter,const(Foo[]),char)
...\dmd2\src\phobos\std\stdio.d(687): instantiated from here:
formattedWrite!(LockingTextWriter,char,const(Foo[]))
...\dmd2\src\phobos\std\stdio.d(1574): instantiated from here:
write!(const(Foo[]),char)
test.d(9): instantiated from here: writeln!(const(Foo[]))
...\dmd2\src\phobos\std\format.d(2572): Error: template instance
std.format.formatValue!(LockingTextWriter,const(Foo)[],char) error
instantiating
...\dmd2\src\phobos\std\format.d(398): instantiated from here:
formatGeneric!(LockingTextWriter,const(Foo[]),char)
...\dmd2\src\phobos\std\stdio.d(687): instantiated from here:
formattedWrite!(LockingTextWriter,char,const(Foo[]))
...\dmd2\src\phobos\std\stdio.d(1574): instantiated from here:
write!(const(Foo[]),char)
test.d(9): instantiated from here: writeln!(const(Foo[]))
...\dmd2\src\phobos\std\format.d(398): Error: template instance
std.format.formatGeneric!(LockingTextWriter,const(Foo[]),char) error
instantiating
...\dmd2\src\phobos\std\stdio.d(687): instantiated from here:
formattedWrite!(LockingTextWriter,char,const(Foo[]))
...\dmd2\src\phobos\std\stdio.d(1574): instantiated from here:
write!(const(Foo[]),char)
test.d(9): instantiated from here: writeln!(const(Foo[]))
...\dmd2\src\phobos\std\stdio.d(687): Error: template instance
std.format.formattedWrite!(LockingTextWriter,char,const(Foo[])) error
instantiating
...\dmd2\src\phobos\std\stdio.d(1574): instantiated from here:
write!(const(Foo[]),char)
test.d(9): instantiated from here: writeln!(const(Foo[]))
...\dmd2\src\phobos\std\stdio.d(1574): Error: template instance
std.stdio.File.write!(const(Foo[]),char) error instantiating
test.d(9): instantiated from here: writeln!(const(Foo[]))
test.d(9): Error: template instance std.stdio.writeln!(const(Foo[])) error
instantiating
I expect both to work and print correctly.
If this is not possible, then I'd like to see a single error message that asks
the programmer to add a missing "const" at line 2 :-)
Maybe related to the closed Issue 7864 ?
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