class RuboCop::Cop::Lint::LambdaWithoutLiteralBlock

Checks uses of lambda without a literal block. It emulates the following warning in Ruby 3.0:

$ ruby -vwe 'lambda(&proc {})'
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19]
-e:1: warning: lambda without a literal block is deprecated; use the proc without
lambda instead

This way, proc object is never converted to lambda. Autocorrection replaces with compatible proc argument.

@example

# bad
lambda(&proc { do_something })
lambda(&Proc.new { do_something })

# good
proc { do_something }
Proc.new { do_something }
lambda { do_something } # If you use lambda.