http://d.puremagic.com/issues/show_bug.cgi?id=2551

           Summary: std.format on invariant values : error and segmentation
                    fault
           Product: D
           Version: 2.022
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: dransic@free.fr


import std.stdio;

class Foo {
    double x;
    this(double x) { this.x = x; }
}

void main() {
    auto ifoo = new invariant(Foo)(0.);
    auto foo = new Foo(0.);
    writeln(foo.x);
    writeln(ifoo.x); // <- Error
}

causes this compiler output :

/usr/local/bin/../src/phobos/std/format.d(2048): Error: no property 'toString'
for type 'invariant(double)'
/usr/local/bin/../src/phobos/std/format.d(2049): template
std.stdio.PrivateFileWriter!(char).PrivateFileWriter.write(C) does not match
any function template declaration
/usr/local/bin/../src/phobos/std/format.d(2049): template
std.stdio.PrivateFileWriter!(char).PrivateFileWriter.write(C) cannot deduce
template function from argument types !()(int)
Segmentation fault


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http://d.puremagic.com/issues/show_bug.cgi?id=2551





------- Comment #1 from dsimcha@yahoo.com  2009-03-27 11:48 -------
The problem is the following code:

    } else static if (is(const D == const(float))
                      || is(const(D) == const(double))
                      || is(const(D) == const(real))) {
      // Do stuff.
    } else // Similar stuff for more types.

The problem is that const(immutable(T)) seems to evaluate to immutable(T), not
const(T), as the following program demonstrates:

import std.stdio;

void main() {
    immutable real foo = 1.0L;
    alias const(typeof(foo)) T;
    writeln(T.stringof);  // Prints immutable(real).
}

This can probably be fixed by changing is(const(T) == const someType) tests to
is(immutable(T) == immutable someType).


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http://d.puremagic.com/issues/show_bug.cgi?id=2551





------- Comment #2 from dsimcha@yahoo.com  2009-03-27 14:28 -------
Created an attachment (id=294)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=294&action=view)
Patch for std.format problems.

Here's a patch that does what I suggested previously.  It seems to solve the problem, and all of the std.format unittests still pass, except for the ones on lines 2462 and 2464, which don't pass even without the patch.


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=2551


Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |clugdbug@yahoo.com.au
         Resolution|                            |FIXED


--- Comment #3 from Don <clugdbug@yahoo.com.au> 2009-10-19 01:19:49 PDT ---
This was fixed between 2.026 and 2.030. I believe the segfault was fixed in 2.027.

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