Should "a,b = x,y = 1,2" give an error?

[Ron M]

This

a,b = x,y = 1,2

give me a
"NameError: undefined local variable or method `x' for main:Object",
yet

a = x = 1 ; b = y = 2;

or

a,b = (x,y = 1,2)

seem to work fine. It doesn't really bother me since the
workarounds are easy, but the first one looks cleaner to me.
Would this still be an error in Ruby2?

 

[David A. Black]

Hi --

This

a,b = x,y = 1,2

give me a
"NameError: undefined local variable or method `x' for main:Object",
yet

a = x = 1 ; b = y = 2;

or

a,b = (x,y = 1,2)

seem to work fine. It doesn't really bother me since the
workarounds are easy, but the first one looks cleaner to me.

It's a bit over-cleaned in this case It's parsed as:

(a,b) = x,(y=1),2

Would this still be an error in Ruby2?

Matz has discussed possibly changing multiple assignment, but I think
in a case like this the rules would still be the same. That's
actually good -- we want y=1 to mean y=1


David