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Problem: In the debugger ">up" and ">frame" select an older function call
frame, but get_funccal_local_ht() and the related functions check
current_funccal while returning a dictionary of the frame that
get_funccal() selected. A :def function keeps its local variables
on the vim9 stack, its funccall_T has no l: and a: dictionaries and
is allocated cleared, so with such a frame selected the returned
hashtab has a NULL ht_array and evaluating any variable name at the
debug prompt crashes in hash_lookup().
Solution: Check the funccal that is actually used and return NULL when it has
no l: variables, so that the variable is reported as undefined
instead.
closes: vim/vim#21111
5ad47b07af
Co-authored-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>