I installed ddwPrototype and ddwCommon using the Quarks GUI. Running the following example from the Proto help file’s “Mimicking object-oriented behavior using Proto” example section
(
a = Proto({
~a = 1;
~b = 2;
~times = { |mul|
mul.notNil.if({ mul }, { ~a }) * ~b
};
}, env: nil, parentKeys: #[b]);
)
a.times; // 2
a.times(5); // 10
b = a.copy;
b.a = 3;
b.times; // 6
b.parent.b = 5; // error!
throws the following error:
ERROR: Message 'b_' not understood.
RECEIVER:
Instance of Environment { (000002B0EA359388, gc=BC, fmt=00, flg=00, set=03)
instance variables [5]
array : instance of Array (000002B0E0D60288, size=32, set=5)
size : Integer 2
proto : nil
parent : nil
know : false
}
ARGS:
Integer 5
CALL STACK:
DoesNotUnderstandError:reportError
arg this = <instance of DoesNotUnderstandError>
Nil:handleError
arg this = nil
arg error = <instance of DoesNotUnderstandError>
Thread:handleError
arg this = <instance of Thread>
arg error = <instance of DoesNotUnderstandError>
Object:throw
arg this = <instance of DoesNotUnderstandError>
Object:doesNotUnderstand
arg this = <instance of Environment>
arg selector = 'b_'
arg args = [*1]
Interpreter:interpretPrintCmdLine
arg this = <instance of Interpreter>
var res = nil
var func = <instance of Function>
var code = "b.parent.b = 5;"
var doc = nil
var ideClass = <instance of Meta_ScIDE>
Process:interpretPrintCmdLine
arg this = <instance of Main>
^^ The preceding error dump is for ERROR: Message 'b_' not understood.
RECEIVER: Environment[ (times -> a Function), (b -> 2) ]
b.parent.know evaluates to false, so it looks like the message isn’t being relayed into the parent Environment.
b.parent[\b] = 5; // Environment[ (times -> a Function), (b -> 5) ], no error
a.b; // 5