Fix assertion failure with anonymous splats #13046
Merged
+58
−0
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When calling a method that accepts an anonymous splat and literal keywords without any arguments, an assertion failure was previously raised. Set rest_index to 0 when setting rest to the frozen array, so the args_argc calculation is accurate.
While here, add more tests for methods with anonymous splats with and without keywords and keyword splats to confirm behavior is correct.
Also add a basic bootstrap test that would hit the previous assertion failure.
Fixes #13043