Fix #14836: FP syntaxError for anonymous struct in for loop #20300

Job	Run time
build_cmake (ubuntu:24.04, true, true)	2m 41s
build_make (alpine:3.23)	6m 4s
build_make (ubuntu:24.04)	4m 36s
build_cmake (ubuntu:25.10, true, true)	3m 24s
build_make (ubuntu:25.10)	3m 19s
build_cmake (alpine:3.23, false, false)	4m 30s
	24m 34s

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