patch 8.2.4219: reading before the start of the line Commit: https://github.com/vim/vim/commit/44db8213d38c39877d2148eff6a72f4beccfb94e Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 25 21:26:17 2022 +0000 patch 8.2.4219: reading before the start of the line Problem: Reading before the start of the line. Solution: Check boundary before trying to read the character.

/^CFLAGS[[:blank:]]*=/s/$/ -Wno-error=missing-field-initializers/
/^RUBY_CFLAGS_EXTRA[[:blank:]]*=/s/$/ -Wno-error=unknown-attributes -Wno-error=ignored-attributes/