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A case where calling a lambda is different between MRI and JRuby #2164

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iconara opened this issue Nov 9, 2014 · 1 comment
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A case where calling a lambda is different between MRI and JRuby #2164

iconara opened this issue Nov 9, 2014 · 1 comment
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@iconara
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@iconara iconara commented Nov 9, 2014

When calling a lambda that has a default argument (e.g. lambda { |a, b=nil| }) it is an error in MRI to call it with more than two arguments. In JRuby 1.7.x and 9k the lambda instead acts like it was created with proc and discards the extra arguments:

$ export CODE='lambda { |a, b=nil| p [a, b] }.call(1, 2, 3)'

$ rvm ruby-1.9.3-p448 do ruby -e $CODE
-e:1:in `block in <main>': wrong number of arguments (3 for 2) (ArgumentError)
    from -e:1:in `call'
    from -e:1:in `<main>'

$ rvm ruby-2.0.0-p353 do ruby -e $CODE
-e:1:in `block in <main>': wrong number of arguments (3 for 1..2) (ArgumentError)
    from -e:1:in `call'
    from -e:1:in `<main>'

$ rvm ruby-2.1.2 do ruby -e $CODE
-e:1:in `block in <main>': wrong number of arguments (3 for 1..2) (ArgumentError)
    from -e:1:in `call'
    from -e:1:in `<main>'

$ rvm jruby-1.7.16.1 do ruby -e $CODE
[1, 2]

$ rvm jruby-head do ruby -e $CODE
[1, 2]
@rtyler
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@rtyler rtyler commented Aug 7, 2015

This has since been fixed in the latest versions of JRuby (1.7.21, 9k)

[15] pry(main)> lambda { |a, b=nil| p [a, b] }.call(1, 2, 3)
ArgumentError: wrong number of arguments (3 for 2)
from org/jruby/RubyProc.java:271:in `call'
[16] pry(main)> JRUBY_VERSION
=> "1.7.21"
[17] pry(main)> 
[1] pry(main)> lambda { |a, b=nil| p [a, b] }.call(1, 2, 3)
ArgumentError: wrong number of arguments (3 for 2)
from org/jruby/RubyProc.java:306:in `call'
[2] pry(main)> JRUBY_VERSION
=> "9.0.0.0"
[3] pry(main)> 

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