fix shadowing build warning #1178

Job	Run time
canceller	2s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	9m 7s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	5m 2s
tests-Windows-CLI (mingw64, x86_64, 3.8)	18m 12s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	9m 31s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	5m 36s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	18m 10s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 40s
tests-Unix-CLI (macos-12, 3.8)	12m 1s
tests-Windows-GUI (mingw64, x86_64)	12m 18s
tests-Unix-GUI (macos-12, 5.9.5)	7m 4s
tests-Unix-CLI (macos-13, 3.9)	13m 34s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	12m 10s
tests-Unix-GUI (macos-13, 5.15.2)	11m 14s
tests-windows-latest-pacman (mingw64, x86_64)	1m 59s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 57s
	2h 24m 37s

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