Merge branch '26' into 26-noreturn
Merge branch '25-char-sym-gc' into 26-noreturn
replace switch in evalv2 with if's, in desirable order
use LASTSYM in set_var_in_frame
Merge branch '26-sym-binding' into 27-eval-overhead
remove more unreached code, declare more things as R_NORETURN.
Merge branch '26-noreturn' into 27-eval-overhead