[ruby-core:118383] [Ruby master Bug#20593] `Kernel#format` emits a `too many arguments for format string` warning when called with keyword arguments and none are used

Issue #20593 has been reported by byroot (Jean Boussier).

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Bug #20593: `Kernel#format` emits a `too many arguments for format string` warning when called with keyword arguments and none are used
https://bugs.ruby-lang.org/issues/20593

* Author: byroot (Jean Boussier)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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`Kernel#format` emits a warning when too many arguments are passed.


It does so for postional arguments, which make sense, as it could be indicative of a bug:

```ruby
$VERBOSE = true
format("%s", 1, 2) #  warning: too many arguments for format string
```

And doesn't for keyword arguments, as it's much less likely to be a bug:

```ruby
$VERBOSE = true
format("%{a}s", a: 1, unused: 2) # no warning
```

However it does emit a warning when passing keyword arguments, if none are used:

```ruby
$VERBOSE = true
format("test", unused: 2) #  warning: too many arguments for format string
```

Which I believe is a bug, as it's common for `format` to take a user provided string to allow for safe interpolation, but with no intention to enforce any of the arguments to be interpolated.

So I think that last case shouldn't emit a warning.




-- 
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