Re: [vim/vim] vim9: SIGSEGV storing to a loop variable from a closure — generate_STOREOUTER() encodes loop depth with a sentinel the executor decodes as an array index (Issue #20877)

neoharju left a comment (vim/vim#20877)

It looks to be the same, you added tests, but you deleted the executor bounds guard (checks loop_idx against out_loop_size and .stack != NULL before dereferencing — so a future encoding bug reports an internal error instead of crashing.) and a UB fix upstream inherited; list_instructions prints -outer->outer_depth, which is signed overflow for INT_MIN (C11 6.5p5). Debug-path only, and upstream's version has it verbatim. Ours negates in unsigned arithmetic.

Anyway, this PR will fix my plugin functioning regardless, and I will not have to manually patch it.

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