Silence warnings about mutable reference to mutable static #440

Job	Run time
regression (macos-13)	54m 40s
regression (ubuntu-20.04)	27m 16s
regression (ubuntu-22.04)	27m 58s
write-json-symtab-regression	17m 35s
benchcomp-tests	4m 53s
regression (macos-14)	29m 24s
documentation	1m 8s
perf	44m 3s
	3h 26m 57s

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