Bug #6039: lambda vs proc; #to_ary w/ splat bug

• Status: Rejected
• Assignee: matz (Yukihiro Matsumoto)
• Target version: -
• ruby -v: 1.9.3

[ddebernardy (Denis de Bernardy)]

to_ary apparently gets called in edge cases when a proc has a splat argument:

good = Class.new do
def to_ary
[:bad]
end
end.new

foo = lambda { |*bar| bar.first }
foo.call(good)

foo = lambda { |bar, *baz| bar }
foo.call(good)

foo = proc { |*bar| bar.first }
foo.call(good)

foo = proc { |bar, *baz| bar }
foo.call(good)

RUBY_VERSION
=> "1.9.3"
good = Class.new do
?> def to_ary
[:bad]
end
end.new
=> #<#Class:0x00000100a39c50:0x00000100a399d0>

?> foo = lambda { |*bar| bar.first }
=> #<Proc:0x00000100a1e248@(irb):324 (lambda)>

foo.call(good)
=> #<#Class:0x00000100a39c50:0x00000100a399d0>

?> foo = lambda { |bar, *baz| bar }
=> #<Proc:0x000001009deb48@(irb):327 (lambda)>

foo.call(good)
=> #<#Class:0x00000100a39c50:0x00000100a399d0>

?> foo = proc { |*bar| bar.first }
=> #Proc:0x000001009aed80@(irb):330

foo.call(good)
=> #<#Class:0x00000100a39c50:0x00000100a399d0>

?> foo = proc { |bar, *baz| bar }
=> #Proc:0x000001010102a0@(irb):333

foo.call(good)
=> :bad

[ddebernardy (Denis de Bernardy)]

Possibly related:

http://bugs.ruby-lang.org/issues/5759

[ddebernardy (Denis de Bernardy)]

Possibly related: http://bugs.ruby-lang.org/issues/5694

[ko1 (Koichi Sasada)]

• Assignee set to matz (Yukihiro Matsumoto)

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Assigned

[ko1 (Koichi Sasada)]

• Status changed from Assigned to Rejected

This behavior is intended.