Hmm - Delphi and Free Pascal do exactly that - they emit a warning, that the first assigned value never gets used.
Am 09.02.2017 um 10:30 schrieb Tim Ward t...@telensa.com [firebird-support]: > > > It' the equivalent in a conventional programming language of saying: > > 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' > sistemas2000profesio...@gmail.com [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. >> >> Or not? >> >> Greetings. >> >> Walter. >> >> On Wed, Feb 8, 2017 at 2:36 PM, 'Leyne, Sean' >> s...@broadviewsoftware.com [firebird-support] >> <firebird-support@yahoogroups.com >> <mailto:firebird-support@yahoogroups.com>> 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. >> >> >> Sean >> >> > > > -- > Tim Ward >
