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Smiie-2
d895c16553
Root cause: unbound template parameters flowed through cbm_type_substitute as NULL, and call-expression return handling then dereferenced the NULL substituted type. Reproduced on MangoHud's src/hud_elements.cpp. - type_rep: cbm_type_substitute now returns the original param `t` (not NULL) when a type arg is unbound, in both the TYPE_PARAM and named-param paths — unbound params stay intact instead of poisoning the type. - c_lsp: guard `if (!ret) return cbm_type_unknown();` before unwrapping the substituted return type; guard the substitute result before use; add template_function call-node resolution (qualified/scoped/plain names). - extract_defs: factor template-inner lookup into find_cpp_template_inner_node, which recurses into nested template_declarations and also handles field_declaration; reuse it from unwrap_template_inner. - tests: clsp_nocrash_template_function_multi_param_nested_call (the nested reproducer) and typerep_substitute_unbound_param_preserved. Distilled from #360 onto current main. The formal-parameter-count clamp that overlapped this PR already landed via #322, so only the additive crash fixes are taken here. Contributes to the C++ stability cluster (#390; relates to #215/#312).