x86_64-managarm-gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations uchar/c16rtomb.c -o uchar/c16rtomb -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
uchar/c16rtomb.c:5:64: error: ‘c16rtomb’ undeclared here (not in a function); did you mean ‘c32rtomb’?
    5 | size_t (*foo)(char *restrict, char16_t, mbstate_t *restrict) = c16rtomb;
      |                                                                ^~~~~~~~
      |                                                                c32rtomb