Ruby » Ruby master

Project *Backport186Backport187Backport191Backport192Backport193Backport200Backport21Ruby master

Tracker *Bug Feature Misc

Subject *

Description Edit I may have terminology wrong, so apologies. For this bug I'm going to use "multiple assignment" to refer to using multiple assignment operators in a line, such as: ``` ruby a = b = c = 1 ``` And then parallel assignment to refer to doing multiple assignments at the same time using tuples, such as: ``` ruby a,b = 1, 2 ``` Unfortunately combining these is inconsistent. First of all, just doing this: ``` ruby a,b = c,d = 3,4 ``` Gives us: **"undefined local variable or method `c' for main (NameError)"** So if we work around that by defining all our variables, we then get unexpected results: ``` ruby a = b = c = d = 'foobar' a,b = c,d = 3,4 puts "Got: a=#{a} b=#{b} and c=#{c} d=#{d}" # Got: a=foobar b=3 and c=foobar d=3 c,d = 3,4 a,b = c,d puts "Got: a=#{a} b=#{b} and c=#{c} d=#{d}" # Got: a=3 b=4 and c=3 d=4 ``` I can imagine that if multiple parallel assignment is not supported that a,b will not get set properly, but it does not follow that c would be undefined by the expression.