Issue #16289 has been updated by marcandre (Marc-Andre Lafortune).


> If they only warn once, they are not that annoying, and people may be less inclined to fix the issue.

It's a warning about an upcoming incompatibility, once should be serious enough!

Maybe it should be reworded to emphasize seriousness, using the word "Deprecated" and "This will not be supported in Ruby 3.x":

```
# Change:
warning: The last argument is used as the keyword parameter
warning: for `foo' defined here

# to something like this:
Deprecated: The last argument is used as the keyword parameter
Deprecated: for `foo' defined here. This will not be supported in Ruby 3.x
```


----------------------------------------
Feature #16289: Reduce duplicated warnings for the change of Ruby 3 keyword arguments
https://bugs.ruby-lang.org/issues/16289#change-82443

* Author: mame (Yusuke Endoh)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
## Problem

Currently, the interpreter emits 200 lines of warnings against the following program.

```ruby
def foo(**opt); end
100.times { foo({kw:1}) }
```

```
$ ./miniruby -e 'def foo(**opt); end; 100.times { foo({kw:1}) }'
-e:1: warning: The last argument is used as the keyword parameter
-e:1: warning: for `foo' defined here
-e:1: warning: The last argument is used as the keyword parameter
-e:1: warning: for `foo' defined here
-e:1: warning: The last argument is used as the keyword parameter
-e:1: warning: for `foo' defined here
...
```

In theory, the warnings are not harmful because they don't stop or interfere the execution.  But in practice, I'm afraid if they are annoying because they flush all console logs away.
I think that the warning is not needed if the call is already warned.


## Proposal

How about limiting the count of warnings to at most once for each pair of caller and callee?

I've created [a pull request](https://github.com/ruby/ruby/pull/2458).  It records all pairs of caller position and callee iseq when emitting a warning, and suppress the warning if the same pair of caller and callee is already warned.

What do you think?



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