#276 constructor namespace

[Tim Tomkinson]

The following script behaves differently in Itcl 3.4 and 4.0.3:

package require Itcl
namespace import itcl::*

class A {
    constructor {} {
        puts [uplevel namespace current]
    }
}

class B {
    inherit A
    constructor {} {}
}

B #auto

In Itcl 3.4, it displays:

In Itcl 4.0.3, it displays:

[Don Porter]

Are those results supposed to be blank?

[Don Porter]

Trying for myself I see that Itcl 3 thinks the uplevel namespace is ::B

While Itcl 4 thinks it is ::

This does not appear to be a recent change.

[Tim Tomkinson]

That is correct. SF deleted the results for some reason.

[Don Porter]

In Itcl 3, compare with:

% itcl::class C {
    inherit A
}
% C #auto
::
c0

We seem to need a constructor in the derived class
to get that class namespace to show up in the uplevel.

Any chance we can call this a bug in Itcl 3, fixed in Itcl 4?
Or is this an important detail that scripts rely on?

[Don Porter]

Found a fix that works interactively, but not in a test suite(?!?!)

Exploring that is finding more bugs.

[Don Porter]

This matter is part of constructor invocation, and is
closely related to

http://core.tcl.tk/itcl/tktview?name=ec215db901

The same reform will likely fix both problems.