Bug #17193: Endless method definition doesn't work with lambdas in IRB

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 3.0.0preview1 (2020-09-25 master 0096d2b895) [x86_64-darwin19]
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN

[kodnin (David Boot)]

Endless method definition doesn't work with lambdas. Please check the attached screenshot.

def foo() = 123
# => :foo

foo
# => 123

def bar() = lambda { |x| x * x }
# I expected the method to be defined.

def bar() = ->(x) { x * x }
# Same issue.

Nice to have:

def bar = lambda { |x| x * x }
def bar = ->(x) { x * x }

[wanabe (_ wanabe)]

I think this is an irb problem, not a ruby problem.

$ ruby -ve 'def bar() = lambda { |x| x * x };p bar'
ruby 3.0.0dev (2020-09-25T22:52:04Z master 137fa5b27e) [x86_64-linux]
#<Proc:0x00005582978039e0 -e:1 (lambda)>

[kodnin (David Boot)]

wanabe (_ wanabe) wrote in #note-1:

I think this is an irb problem, not a ruby problem.

$ ruby -ve 'def bar() = lambda { |x| x * x };p bar'
ruby 3.0.0dev (2020-09-25T22:52:04Z master 137fa5b27e) [x86_64-linux]
#<Proc:0x00005582978039e0 -e:1 (lambda)>

I can confirm that this works indeed.

$ ruby -e 'def bar() = ->(x) { x * x }; puts bar.(3)'
9

[mame (Yusuke Endoh)]

• Subject changed from Endless method definition doesn't work with lambdas to Endless method definition doesn't work with lambdas in IRB

[taiyoslime (Taiyo Mizuhashi)]

This seems to be fixed in https://github.com/ruby/irb/pull/131. Please check it out.

[aycabta (aycabta .)]

• Status changed from Open to Closed

As @taiyoslime said, I confirmed that it was fixed in https://github.com/ruby/irb/pull/131.