|Subject||Re: [firebird-support] Is this a bug of Firebird?|
x = a;
x = b;
where the compiler is expected to know that neither a not the first assignment have any side effects other than the assignment (and where the expression b doesn't depend on the value of x)(and where x isn't volatile, ect ect).
A compiler *could* detect and warn about such things (ie it's not forbidden by the laws of mathematics) but I don't think I know of any that do. And as there are good reasons for deliberately wanting to do the above it could only be a warning, not an error.
On 08/02/2017 23:36, 'Walter R. Ojeda Valiente' sistemas2000profesional@... [firebird-support] wrote:
The error is of the programmer, I agree with you, but to repeat the name of a variable without the Firebird showing any message of error is, at least for me, a bug.
To have 2 or more variables with the same name after the INTO clause is useless. The compiler can be smart enough to detect such thing.
On Wed, Feb 8, 2017 at 2:36 PM, 'Leyne, Sean' Sean@... [firebird-support] <firstname.lastname@example.org> wrote:
> Yes, but I can not know the value of the column X.ALU_NOMBRE
> And the idea, of course, is know that value, that's why it appears in the FOR
> SELECT. If not, I can do nothing with X.ALU_NOMBRE
You are asking for the system to evaluate the *intent* of logic.
That is completely outside the purview of any application environment that I know.
The only thing that a system can check/enforce is the correctness of the code, not to check whether the developer has 2 brain cells.
-- Tim Ward