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Previously, fish's command_not_found handler would be installed in __fish_config_interactive. Errors that occured early in startup (e.g. in config.fish) or in non-interactive mode would therefore not be reported. With this change, fish now exposes its default cnf handler as __fish_default_command_not_found_handler . config.fish then installs a cnfh that invokes the default. When fish goes interactive, the initial cnfh is overwritten with a fancier one, that may in turn fall back to invoking the default.