The following program uses an anonymous nested function which captures a local variable. It seems the arguments get corrupted (likely because of the hidden first param for the nested function signature) and prints garbled data. I reduced this snippet down from another project but I’m not sure if this is the best way to reproduce the real issue.
Is this a compiler bug or am I doing something wrong?
===========================
{$mode objfpc}
{$modeswitch anonymousfunctions}
{$modeswitch nestedprocvars}
program test;
type
generic TMyClass<T> = class
type
TCallback = procedure (data: T) is nested;
procedure Call(callback: TCallback);
procedure Test;
end;
procedure TMyClass.Call(callback: TCallback);
begin
callback(default(T));
end;
procedure TMyClass.Test;
var
i: integer;
begin
Call(procedure(data: T)
begin
Inc(i);
writeln(data); // prints garbled data like 73251232
end);
end;
begin
specialize TMyClass<Integer>.Create.Test;
end.Regards,
Ryan Joseph