www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - assertion failure with template instantiation of forward reference

reply "comco" <void.unsigned gmail.com> writes:
When trying to compile this code:

import std.stdio;
class A;

class B(T) : T {
}

void main() {
     writeln(typeid(B!A));
}

I get this error: Assertion failure: '!scope' on line 358 in file 
'toobj.c'.
Shouldn't it be more like: Error: class main.A unable to resolve 
forward reference in definition

Looks like a bug?
Nov 28 2012
parent reply "bearophile" <bearophileHUGS lycos.com> writes:
comco:


 Looks like a bug?


This is what DMD 2.061alpha prints, it doesn't crash:

...\dmd2\src\phobos\std\range.d(603): Error: static assert  
"Cannot put a string into a LockingTextWriter"
...\dmd2\src\phobos\std\format.d(2349):        instantiated from 
here: put!(LockingTextWriter, string)
...\dmd2\src\phobos\std\format.d(2782):        instantiated from 
here: formatValue!(LockingTextWriter, TypeInfo_Class, char)
...\dmd2\src\phobos\std\format.d(415):        instantiated from 
here: formatGeneric!(LockingTextWriter, TypeInfo_Class, char)
...\dmd2\src\phobos\std\stdio.d(712):        ... (1 
instantiations, -v to show) ...
...\dmd2\src\phobos\std\stdio.d(1618):        instantiated from 
here: write!(TypeInfo_Class,char)
test.d(5):        instantiated from here: writeln!(TypeInfo_Class)

Bye,
bearophile
Nov 28 2012
parent "comco" <void.unsigned gmail.com> writes:
On Thursday, 29 November 2012 at 01:38:50 UTC, bearophile wrote:

 comco:


 Looks like a bug?


 This is what DMD 2.061alpha prints, it doesn't crash:

 ...\dmd2\src\phobos\std\range.d(603): Error: static assert  
 "Cannot put a string into a LockingTextWriter"
 ...\dmd2\src\phobos\std\format.d(2349):        instantiated 
 from here: put!(LockingTextWriter, string)
 ...\dmd2\src\phobos\std\format.d(2782):        instantiated 
 from here: formatValue!(LockingTextWriter, TypeInfo_Class, char)
 ...\dmd2\src\phobos\std\format.d(415):        instantiated from 
 here: formatGeneric!(LockingTextWriter, TypeInfo_Class, char)
 ...\dmd2\src\phobos\std\stdio.d(712):        ... (1 
 instantiations, -v to show) ...
 ...\dmd2\src\phobos\std\stdio.d(1618):        instantiated from 
 here: write!(TypeInfo_Class,char)
 test.d(5):        instantiated from here: 
 writeln!(TypeInfo_Class)

 Bye,
 bearophile


Nice. Thanks!
Nov 29 2012