(If you find progress and other non-error messages irritating, you can use -q to suppress them)

(You can use the -w option to dump extensions.conf format to extensions.conf.aeldump)
LOG: lev:2 file:pbx_ael.c  line:3910 func: pbx_load_module  Starting AEL load process.
LOG: lev:2 file:pbx_ael.c  line:3917 func: pbx_load_module  AEL load process: calculated config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:3925 func: pbx_load_module  AEL load process: parsed config file name './extensions.ael'.
LOG: lev:3 file:pbx_ael.c  line:712 func: check_macro_returns  Warning: file ./extensions.ael, line 130-183: The macro stdexten does not end with a return; I will insert one.
LOG: lev:3 file:pbx_ael.c  line:712 func: check_macro_returns  Warning: file ./extensions.ael, line 185-192: The macro uvm does not end with a return; I will insert one.
LOG: lev:3 file:pbx_ael.c  line:712 func: check_macro_returns  Warning: file ./extensions.ael, line 194-201: The macro bvm does not end with a return; I will insert one.
LOG: lev:2 file:pbx_ael.c  line:3928 func: pbx_load_module  AEL load process: checked config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:3930 func: pbx_load_module  AEL load process: compiled config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:3933 func: pbx_load_module  AEL load process: merged config file name './extensions.ael'.
LOG: lev:2 file:pbx_ael.c  line:3936 func: pbx_load_module  AEL load process: verified config file name './extensions.ael'.
LOG: lev:4 file:ael2_parse  line:479 func: main  38 contexts, 90 extensions, 492 priorities