From: zn@...
Date: 2020-12-03T02:45:24+00:00
Subject: [ruby-core:101209] [Ruby master Feature#17361] lambda(&block) does not warn with lazy proc allocation

Issue #17361 has been reported by znz (Kazuhiro NISHIYAMA).

----------------------------------------
Feature #17361: lambda(&block) does not warn with lazy proc allocation
https://bugs.ruby-lang.org/issues/17361

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Open
* Priority: Normal
----------------------------------------
In NEWS,

```
        * Kernel#lambda now warns if called without a literal block.
          [[Feature #15973]]
```

But the following code from https://docs.ruby-lang.org/ja/latest/method/Kernel/m/lambda.html (<https://github.com/rurema/doctree/blob/495868c466c97c9bcca28d64d6ce0d68350de3e2/refm/api/src/_builtin/functions#L2436-L2441>) does not warn.

```ruby
def foo &block
  lambda(&block)
end

it = foo{p 12}
it.call #=> 12
```

Once block assign to a local variable, it warns.

```ruby
def foo &block
  b = block
  lambda(&b)
end

it = foo{p 12}
it.call #=> 12
```



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