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Fix function call name token type in function_indexes method #994

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Job	Run time
spec (ruby 2.7) / spec	34s
spec (ruby 3.2) / spec	26s
spec (ruby 3.3) / spec	23s
acceptance (ruby 2.7) / acceptance	31s
acceptance (ruby 3.3) / acceptance	16s
acceptance (ruby 3.2) / acceptance	18s
	2m 28s